Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b7bba64823ff39…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 00:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aec7cf9d708717a2af1e8a9af9638439 SHA-1: d6cf864a59673a536933bcd22dcc6f817e6cebd4 SHA-256: 66b7bba64823ff3941349defc51d630ac3e9b674665e1ec113d929302c01cbf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised websites and potentially malicious content. The heuristic findings indicate a pattern of using compromised WordPress uploads and disposable hosting for these links, suggesting an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://queure.ru/uplcv?utm_term=reading+comprehension+gerunds+and+infinitives PDF link annotation
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b62c40df0df---vudafiporevufajet.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/luwikexutomupud.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/rloaeeablvkgcifivdhr53inl1/takinepowukew.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/89495291945.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cef40981525---6178185373.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/b24b4ee0bd9028a1b8e896e28bdd439e/raverusejetisamexeduxavaj.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/93017008036.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/umtnjn5933njij1b7u2pmdbnr3/82952691978.pdfIn PDF document text
    • http://kudusde.org/resimler/files/zarurodozowoboroza.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/5af10caa01acf534020d5c6c26048a84/sukizawowukeferadunasuka.pdfIn PDF document text
    • http://daydala.com/userfiles/file/rewokotesebebal.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f809391445---xafobexix.pdfIn PDF document text
    • http://st03.it/userfiles/files/nekanojegikezexukikelob.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/tizujujofodagor.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/zuxorepuwoze.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9562085071.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046a66a78d---bakisenadejuxalumo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/19787928764.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/wizosuzav.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f5525609c6706e476dacd3cbf7a306d9/31228969245.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/dbq5m2b9v1adm4gftv7006kg10/gesojotugiluvamojumorega.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/zumimekikiw.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/wimiwubowo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 11232 bytes
SHA-256: 7ed2744a968c4c16f0ba5424d871d1d83198bcf33b09fe8ace0437238ec38160
font_01_sfnt_off00010505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D17 17072 bytes
SHA-256: 43294322ff93d605ad169896958204e62c9680d0cc691e3ad195411a5ee0f843

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