Malicious PDF — malware analysis report

Static analysis result for SHA-256 81733b205564040b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 20:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c290b449c285fbc23a31c8406215f30e SHA-1: 1247f39ee679765ff6fa0b2c84d858282c84791c SHA-256: 81733b205564040bfc6c85848fbab9b7aa2544303c0b1cc13ae3c59dbbad3cb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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 https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/e17f30jtnml4u6kvf6addng1s6/gometitekapev.pdf In PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/hcue1qp194n1dd0pl742hvcnrc/27516189502.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/sudesowufavabigo.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/15523710329.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/3323273533.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/75932648084.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/lusijovuravaf.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/32246425535.pdfIn PDF document text
    • http://surestegc.org/documentos/file/59728731904.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/fazupunoxudamokefurit.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/tifajoretavof.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210916100420193102hu24if.pdfIn PDF document text
    • http://becucci.it/userfiles/files/96998331645.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/52851766713.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df6114227c---89406889042.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4jcl3untof43ltngk491vuhcmq/borububow.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141196f45ae7---1222777666.pdfIn PDF document text
    • http://staropolski.net/Upload/file/tixun.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/nimepixilusowerogelixo.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16140becb78145---93637362820.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/93973649873.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/limunarijukuwamusofed.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/nerubuzomoxumibalifafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ad+free+apk+for+androidPDF 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_off0000b810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB810 10252 bytes
SHA-256: 3dc565d0aef26e33301935679093af4be98d582a065e775ae36dfa9b68e525ee
font_01_sfnt_off0000cf2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2B 16036 bytes
SHA-256: 6696850a83c2f11b4a37eb2c87aad5a7b736575d6f8b064fa522211427444794
font_02_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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