Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb2b64a577571dcb…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 14:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7f9d64a8656abe9da440819fcfce0173 SHA-1: af12ddb8a52a75cfc9269a70bd8e20235d7f1df7 SHA-256: fb2b64a577571dcbab627f9c1c4e45e89cc5c4dba04854aeeb43056c785d7574
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bhavalaya.org/ckfinder/userfiles/files/rubuti.pdf
    • https://kabelkyaobuv.sk/editor_uploads/files/dufidexuraveb.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6cc450e12---62532908003.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a3d70aa0---23897659731.pdf
    • https://thai-airpark.com/ckfinder/userfiles/files/wetiwatufurafos.pdf
    • http://progettarecasa.com/userfiles/files/samoxefosilijefalazed.pdf
    • http://medeeatour.ro/mm/file/dokemawewofixibekil.pdf
    • http://danchrisjewelry.com/userfiles/file/22319515949.pdf
    • https://jordan.si/dokumenti/file/gowubagazo.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133470b8ddf4---61968694168.pdf
    • http://philipp-haberland.de/images/upload/file/sagulewo.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/42254960405.pdf
    • https://refakatci.net/userfiles/file/rijakaligu.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e54294c2b---sumufufub.pdf
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/zivuradunoxawunivanofan.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/161380fba3ef73---16600018260.pdf
    • http://tuzy.pl/Upload/file/77138118299.pdf
    • http://hydrem.ru/images/file/88206219542.pdf
    • http://murzilka.biz/images/uploads/file/zuzenodijovabisax.pdf
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/33549469119.pdf
    • http://conomiya.com/images/uploadedimages/file/16247013671.pdf
    • http://it-hair.com/userfiles/64382819996.pdf
    • http://www.shjkyq.com/up_files/FCK/file/jevixuk.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2gb+games+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 16792 bytes
font_01_sfnt_off0000ecc3.bin
5ef76bd097211b122561ebf312ca33ac8a2c2a5153a503945cdd73c8026a990e
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC3 16980 bytes
font_02_sfnt_off0001188d.bin
0369a514c5c2c8b82e738bd4548bf1309c81c6d237604177be232d2c6de2b420
pdf-font-stream PDF embedded font (sfnt) at offset 0x1188D 10716 bytes