Malicious PDF — malware analysis report

Static analysis result for SHA-256 4261e41dc853d0e8…

MALICIOUS

PDF

116.7 KB Created: 2021-07-22 22:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: edc0ae3065d568b3f2824d547842f438 SHA-1: bef6403f263083d3ebd9e211db8ed999ad47b050 SHA-256: 4261e41dc853d0e8e1f3e7d49e69eb62a2c33a8e448e12134a87f3703c3ad4ba
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable and potentially compromised domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the structure and embedded URLs are indicative of a malicious PDF designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://altaprecision.com/userfiles/file/60546827719.pdf In PDF document text
    • http://bigsvatcharasith.com/userfiles/file/vawozinonanuledosamutada.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba2a66f3c2---50459839799.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94582472054.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/bobosasemoluro.pdfIn PDF document text
    • https://ratsimae.eemedia/contents/file/nulenebuzobopirawodaj.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b462593ee69---pifulenigipivu.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/gunogaragewojorifepu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c981ded4b---texotasexakokeburaro.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/5jtfhshebs2pepa7of7oa2t4l0/25519585026.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/f825dnn5g516153a8dh44leh09/56075574322.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/wosudoge.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/3668222555.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9f5b3deccf5a2702a88405e29dae101c/timudikojopod.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/885739f36494cbafa997ba899137ab50/melatoxe.pdfIn PDF document text
    • http://izdo.org/img/userfiles/files/16274257929.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/94086331883.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/situserafufedozenopidebe.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bad10674e---98206390404.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607118ecdc5d5---xapowibidulojelo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160999129a4ce2---rebapilokajawetod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=screaming+meaning+in+tamilPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000159df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x159DF 18328 bytes
SHA-256: d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
font_00_sfnt_off00012a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6D 10360 bytes
SHA-256: c140eb6c08f32d9ef4bc4e1e8c303f886e275eae482826fb0ecb51d2e38bfed3
font_01_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001777c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1777C 25220 bytes
SHA-256: 4e953d9a3ac5cb713126ff9dca9aca3bd5b2cdcb36d8017315ecdd91f4aa581d
font_04_sfnt_off0001b4c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4C5 3464 bytes
SHA-256: a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff

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