Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc398881b5de348c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 21:58:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7784ab79ed096d9ecf84e2ddd5bd87d7 SHA-1: eec17fdda9a23d9da4479d26328f1c4a6c1c8821 SHA-256: bc398881b5de348c3c42220dd5a9134fb2b62dcd91a8b3d73633b0697cce582a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=among+us+download+2020 PDF link annotation
    • http://monkey-do.net/userfiles/file/rafogikotiruzij.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/79081903028.pdfIn PDF document text
    • http://ashioke.com/images/library/File/nitofotivekaxadokejobon.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/32889790448.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355866c83e8---423518942.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134342a43897---befalesolik.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/guzabuxutojekuvur.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c30284cfef31e649b6a36d1e90b62b8/zifigopagopikeruzegoresu.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210911081934.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/67083358090.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/falaxego.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/59395917309.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/zusotelazozon.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/69736888900.pdfIn PDF document text
    • https://speculatio.in/userfiles/file/tiwaxukusodurubasuvenufaf.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-1/20210901101325462230.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/pivopesururinirur.pdfIn PDF document text
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/kupugabilo.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/83279517572.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/benuk.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/rexuxixijeziboxu.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/gemikalivabuwafaxalus.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/bovedigizagotenup.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/60881486856.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/4d7a85cf7b62ea3f64fe228aab45706a/69122059744.pdfIn PDF document text
    • 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_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 17208 bytes
SHA-256: 35eeb2019b2966acde8880f611e46fdf701ba2476db3a6c5fda993aa38c33efc
font_01_sfnt_off000101ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C5 10576 bytes
SHA-256: 0255fffd33a48691b1ebbdb97916a3eb011e6b9160c4747b1d8dfac0b008dbe5

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