Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee50c342c68010f…

MALICIOUS

PDF

78.3 KB Created: 2021-09-01 18:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21e7bc4bfa40044619271866bba95cd4 SHA-1: c864ec63bc1187b32c2d0e50bf242082bedabff8 SHA-256: 2ee50c342c68010f9def87905b0eabf5de1ed9fecdd95ed3aceb09bfd59f1102
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://huntic.ru/uplcv?utm_term=you+already+have+me PDF link annotation
    • http://namngonviet.vn/user-/files/kijopam.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/35945990688.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/juwefi.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/rojejanasuxuxubizuj.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f698be17345---16248486801.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099a5a1a2e7c---vojaximibolaxotuwizi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/46074266424.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/366311318.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/zaxujomawat.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/15583634252.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///dabot.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/122e17ae3073d9f2ab6b1368a35abbde/zalutotelibafen.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/wubokibeduvifuwupevalev.pdfIn PDF document text
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/94880446085.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa05a3a970b---5176295671.pdfIn PDF document text
    • http://riph.pl/userfiles/file/9996082518.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2c60dd07796eb40a4f518c94dfe51283/bilenipuwajoruberi.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ofi4odogcdjo58hvlt6etuh1jh/nozesu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b8d12e466d---ledupinefowakinar.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/32037438221.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758ef29c421---fexakewixo.pdfIn PDF document text
    • http://jarosi.hu/files/file/pumelofenepef.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60186ef4be---45431629297.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/jepewerusov.pdfIn PDF document text
    • http://garderoba.sk/images/_file/84656256233.pdfIn PDF document text
    • 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_off0000c48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC48E 20964 bytes
SHA-256: 8d7af4bf2b1a76876a06f01d49c85645c958e5e92546b9086ce40406b4f7e0da
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 10316 bytes
SHA-256: ded3acf3d661e01ccf834d01a5f0fadb6322284ab79f985077a2af3b173932ea
font_02_sfnt_off00011166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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