Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f189f4f5b3295fd…

MALICIOUS

PDF

79.8 KB Created: 2021-09-02 18:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 93d2484464c071e134289d3559003d21 SHA-1: 759a708b584dba85ae9cd14ce485f3e5fd990de8 SHA-256: 7f189f4f5b3295fd3844fac8207fea73b91811468187f6a61ce2b9a4c4bc7760
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to distribute further malicious content or phish for user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://amitadevnani.com/userfiles/file/7270588008.pdf In PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4ba263df7---patulakuv.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/57630104875.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e817de5290---19546621837.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608744f134762---nademinino.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/72fc3bc0d564252ff6087de3faa04763/rezenudozo.pdfIn PDF document text
    • https://designclarf.it/file/60326676454.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160facf6ed9895---zujatozelanibosalorat.pdfIn PDF document text
    • http://stopguepes72.fr/userfiles/file/jivoresor.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/75dd7cb2abee2bc43473c3eae9ce5a58/nojito.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108111825218781.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/dovajikuximodopovekajiro.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/13037811299.pdfIn PDF document text
    • http://ge-mak.com/files/jafajofinoripedesabinidix.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c1bd7f28---78619467740.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/pibodapovitenijine.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f34eee56---nusipari.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e717dacc97---6612250548.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16113863c259d6---15684732938.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/5491104604.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/358vll0a7h4ipdk9huu7mato60/15367484555.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/82687029775.pdfIn PDF document text
    • http://contua.org/userfiles/file/midodosoranunigid.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/vusominajifofagi.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/ravalatixa.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/62362690104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=verbs+to+nouns+pdfPDF 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_off0000d44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 17780 bytes
SHA-256: b828d2b83c082ea6c966e039476af8d8e099639a51ca9c0cbd61c0cddba26460
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 10400 bytes
SHA-256: 1e4775b3ad35f66cda786e0ffde1eb20ae4b4d924dc572b96855402103ee84c5