Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab8806f20c7d655…

MALICIOUS

PDF

89.2 KB Created: 2021-06-30 04:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90a5ccfac93c51faf50671304a71d5b9 SHA-1: 2be9335fa41ff992e378cddb29545e662d3f7703 SHA-256: 3ab8806f20c7d65516c51b9b9d4efc712176440c66453212456e6b7cccd6831b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/3302517a1d4167a4bfd362494c5cba25/gapipume.pdf In PDF document text
    • http://libertyquad72.fr/userfiles/file/vudogowaxixiletejabadeb.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/rutigakabof.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/xogajiwusejixokowiviriz.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-21/20210521223722816874.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42020070346.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/pic681ciuaicq3cd8oqjjjmb8u/57688810448.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202106181359447929.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608740c867833---ruzixerafedox.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/pilixuzedukewiniperetili.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/22581290423.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90c595ae4---37285546669.pdfIn PDF document text
    • http://zuche0551.com/upload/file/bojeluga.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/13508878543.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079f25fe60eb---23548758468.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/94f41b703585873c00dd5a239737aa4b/6444864310.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160705a6becc46---70832039444.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/8641552a7038f3590cfd8a4d3595f1a6/wefosevavizadeket.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9904741a6---96432564826.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/8cf6eaf614e85413c44e164d18e907aa/23393138688.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/4lv1dhj33u7532lrs4i7fq6vni/93272883268.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/ned1h3bjh3afpqg3tnr495u61v/demevunimokebojuregobe.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/f1jhb6g2s42l5cluid5bohtoc3/sapinusagusizip.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jofarewuwikivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=picture+math+answersPDF 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_off0000fa7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7A 17344 bytes
SHA-256: 2f45a0cacb9de4ed74ec6e7831b8c2b8896d3a4d91a59408379f13c7b4e86984
font_01_sfnt_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14039 10516 bytes
SHA-256: 436e241cefefdf8b8bbbf85069209f0d41e0f997321deba62d065cfa0d66ddcb