Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ce3fb9b820025f…

MALICIOUS

PDF

80.7 KB Created: 2021-08-14 12:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 617e004759ec55dd4676bc1a530d132e SHA-1: f2c2a90db94782f9615a737d82378311b7f65d57 SHA-256: e7ce3fb9b820025f3216196dc20cbc0cb7bbfe87cbf2708fd1b5381de4dbec17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for human readability but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://medvor.ru/uplcv?utm_term=garage+cabinet+plans+pdf PDF link annotation
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/97e1012tgu3q7rmt9papgdcqnf/nefojudimusezolun.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe13d45cad---98530767214.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/61769341522.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/gesufen.pdfIn PDF document text
    • https://izr.fr/files/47354788464.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/q8nlqs0s8oqmv79f987lb53425/xunerubafuzipugugizone.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/rimunoxoridalizu.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a854503d3f---38755544935.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a39ba47af1---51059600648.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e195bbb61c6---58189834467.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/nizumire.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a34b8d6a9---nudodex.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091d8c8966e6---xixoromatifo.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/xokosonedudixuxufage.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2677eaadace2cd8e353a32c2a40652a5/9458031254.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/4061b5ab7e4b1d7d16d6029fe32670c3/vevorunid.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/omik9np92e8c44fd4a8kgnnf8t/zemaw.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4c26960c---27263363341.pdfIn PDF document text
    • http://millecolori.it/images/file/57329892482.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/4e06afc67e3a8878faf3fa3c93fa6520/46819105450.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/45323345701.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/93504159239.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210509015343769.pdfIn PDF document text
    • http://allasclub.com/campannas/file/zimibidawofafem.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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 16740 bytes
SHA-256: a9ee8eef1fc337cc115699a07eb1e1ca51b11ed6bcff8e795bc99fbcb4476f83
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 10852 bytes
SHA-256: 9dab1ea2394690ae00c840830f54c1451dbcce032f7727e34e733de147afc682
font_02_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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