Malicious PDF — malware analysis report

Static analysis result for SHA-256 2881d21a4926f39d…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 05:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d810deae8c1f045ab93ae77675346cb8 SHA-1: 3da34b14e1ce5f3f6c1d2c833be834552a0fd689 SHA-256: 2881d21a4926f39dafa79d17dbb952717e82e7862baa45d00c2904de99155774
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary attack pattern appears to be luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://synerhu.ru/uplcv?utm_term=nagoor+babu+core+java+notes+pdf PDF link annotation
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8d67ee511---95213076913.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dea907818627ab2a9cfd4e7b70f895ae/53941354471.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/99545904929.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/bd79bd880e41e8052058b09ecdc03a4c/debipogigelekoduri.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/27382458876.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/kixetane.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/97452073293.pdfIn PDF document text
    • http://besteva.com/upload/files/domudaz.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f796882ee---xunekolazewegavulupilu.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/redozo.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2b4b6f20---24270393207.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/diususaq2fu7btao5ae0men9fp/16102091714.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/75552868297.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ba3ab1035419f8fb70e908d0a636ffc0/86735504043.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/welojasepusuwu.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc91981ffa4---rilamere.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/r45r58op8gd90gl3kadsadus09/zawaga.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307e8547665---84735049326.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f63a8973dc7---74123326802.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b271d689b0e---13977531908.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/guvoxogozotokonururitavux.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/romazidelopaxevu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17ed90ce53---91576717743.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_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 11068 bytes
SHA-256: eb4509fb40191f7991e3ecc7bee1207824b47c13928000ef05b2f9095ca60465
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 17596 bytes
SHA-256: ba1024f6640cbe27cf678470b8d11427484c75f819290e65bb863bc60be9ea04

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