Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3f6944daeaf7b7…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 17:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 91c1c748c678e0168b8114b026a2af4d SHA-1: 75f16d9a3bcc09498447a1867068d28325d7e2df SHA-256: 1c3f6944daeaf7b70e0614e30775981b1cbd5ba94dea78ba043645feca3a2ac6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, which are likely used to host phishing content or distribute further malware. The presence of multiple links on potentially compromised or disposable hosting indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://zdrowejaja.com/Upload/file/59401108804.pdf In PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xedusunevetizisiru.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/vopanimokovokepukoli.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/gupirosokigoxiz.pdfIn PDF document text
    • https://soechi.id/userfiles/file/59331597201.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/58e0ad1e8d907f83762be79b1a72b1e7/tujikijimeferibijovoluvu.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/221689267.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077865a500b7---82611509678.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/taremefutumarosajupepib.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/gufejokekuzimo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37e593611b---zawevemidedakorono.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e360a4790bc---28060326620.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/zezokogabax.pdfIn PDF document text
    • http://meta-min.com/files/80446613249.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/fumalibudob.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706d57c7669---vosexip.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/finogamubaneseza.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/84593801773.pdfIn PDF document text
    • http://multiflex.ru/userfiles/file/liduzofog.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116aaeda6108---fubija.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/wefupodijefab.pdfIn PDF document text
    • https://fototipia.hu/files/files/83927046974.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/lutidabifiwafuxadaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=all+i+want+for+christmas+is+you+picturesPDF 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_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 17796 bytes
SHA-256: 6f94cfa6030426c86bee0372b95e049447343ca7b9b596e264c088a26502da59
font_01_sfnt_off00012534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12534 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4B 11028 bytes
SHA-256: 446b0956e4a5ee39c514d7ed5dde5c39f07614d63d71411dc34d8708251bffb2

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