Malicious PDF — malware analysis report

Static analysis result for SHA-256 d68319205352cd69…

MALICIOUS

PDF

137.1 KB Created: 2021-09-02 23:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4f669b57398f439b96691e9e0d9f3d0 SHA-1: ecf3e326a7df657c35b7051b4784a140ea850825 SHA-256: d68319205352cd693c8145c9d91ecf4f52fff93defc04062f4ec6fc8cf6493e5
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to potentially compromised websites and disposable hosting. These links likely serve as a lure to download a second-stage payload, as indicated by the ML classifier and ClamAV detection. The use of algorithmically generated URLs and link farms suggests an attempt to evade detection and distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ambulatorioveterinarioscapindandrea.it/userfiles/files/99925232652.pdf In PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750762ef03d---gafami.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/9694465957.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace5f04fdf2---pekaji.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607de159318b9---powimisefijirijasov.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608112059e3e5---99129275232.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073082c27077---35416022141.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-6/20210506020936532731.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/mosepexukijoropivonu.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/pezuzutivakikubada.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/kuwivifijuxadefasiwosavij.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f19c790e9---5718947379.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/f1fa85bd26241d93fcbc5809abd68604/zererezukirojele.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/kokudewosegogaxenirazub.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/566e53e7eafc8e2634501a375b759f1e/xuxasowirogojaroravexaze.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/91542617333.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/xexefotopamemewiwexorurur.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/zejago.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160728ea8e6ef8---wusikawegolalasobid.pdfIn PDF document text
    • https://signika.pl/Upload/file/53791460076.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/68464726589.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/85411565739.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/31821447092.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sinevasebaro.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/69066775926.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb6690586b---kifatefijudekalogen.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=disorder+in+the+court+book+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B06C 10844 bytes
SHA-256: 3c3f570960306f20b858e0f3acd63168435da019e2db822df8d6f7ee8b964cc1
font_01_sfnt_off0001c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C92A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e13c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E13C 20184 bytes
SHA-256: cd8742e0b7694f438d857bdb71faf30d5c40f1d4fda1faf1dd90daf364a30281

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