Malicious PDF — malware analysis report

Static analysis result for SHA-256 70528c03ec9e3b48…

MALICIOUS

PDF

78.2 KB Created: 2021-06-29 14:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 31100572fc65e3899d8a6c71e5983aa3 SHA-1: aaa739949ddb4ee82216291f360fac85d43d021a SHA-256: 70528c03ec9e3b48dd6ac213c049796ac1a03432daa063f469375240f32081cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and link farms, suggest an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2b392769---83378129777.pdf In PDF document text
    • http://interreg-ipa-husrb.com/downloads/begurugonelijakumukiwotu.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/sezudikiguradudi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3961e4305b---37205842478.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/70cb8a6ab96a7947c6ab29c261415bda/rikujutilolokebevizikido.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e2c904a7e97cd5e536559a5f8a3c7a6d/5063080951.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/20d7de6db1bd49b4b7fd747de4612861/79770194706.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a418796f1a9---70851327059.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/sol4kb0jfhis0jsn7t1ghlc6c8/51914165915.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/c84a005a9da23c052e99585c2755b256/wadiluvajajoni.pdfIn PDF document text
    • http://jngf.cn/files/file/jabasodelonizuxutifared.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c87ff614bf---botolubosarexokoremoju.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e62e1ad8d703240063e793d97a93e8c8/tojum.pdfIn PDF document text
    • https://33mobility.net/uploads/files/43138428310.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a464cc2e38b---91170808714.pdfIn PDF document text
    • http://sb-78.ru/files/file/balexurujijumebajob.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/nebegumapusokozomidiwuzuv.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b50f26b1a60---gaputipubutamikaga.pdfIn PDF document text
    • https://olterus.info/contents//files/zuwetizetexode.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/lf613v9uk31vk9jbua1b72keqo/97700128436.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbac96c36b---kurasuwewuzisob.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76de1f019f---basorifuwosubipe.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/lotokixigipokimiji.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/malunipofoj.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf24293596---38051481913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=scanned+pdf+to+text+converterPDF 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_off0000cc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9D 18432 bytes
SHA-256: b3a58f8e3d102c70f5610496e2da8f5c8fcb839550fa0d8dda4102271f6e40c3
font_01_sfnt_off0000fafb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFB 10548 bytes
SHA-256: 722fce02dd6c76b1d0b788bde1a6dd9f00e8172422f0a31a9016a87d636f4884
font_02_sfnt_off0001133b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1133B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1