Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcb72d2c363ccb8f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 06:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14415e5c97c906877621f60dc3bf9e57 SHA-1: 807a91a0e7adfa6a3ada3a8559f64ce7b403393a SHA-256: fcb72d2c363ccb8fc32a873f3ca3aa624f2fa9b73ec4dde28b6275241fec20e0
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 for phishing or distributing further malware. The presence of multiple external links and the nature of the hosting domains are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://pistant.ru/uplcv?utm_term=i+am+crazy+about+you+meaning
    • http://suliaok.com/v15/Upload/file/20219161411214097.pdf
    • http://ore-processing.ru/d/files/wunuben.pdf
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/8240152360.pdf
    • http://parcroyale.hk/userfiles/degedibezim.pdf
    • http://proallprint.com/userfiles/files/tobimenuvujejobi.pdf
    • http://vangphutai.com/images/uploads/files/vakin.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/pezuzow.pdf
    • http://nguoiquangphianam.com/uploads/files/gitawirazi.pdf
    • http://thongthien.vn/upload/files/53996130193.pdf
    • http://vrajacreation.com/uploaded_files/userfiles/files/39058349309.pdf
    • http://sportyou.fr/ckfinder/userfiles/files/62927014972.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139270403b13---88603793737.pdf
    • https://radiosmile.hu/upload/file/30768484882.pdf
    • http://abwmercury.com/uploads/files/wewamupakavisobupevejalu.pdf
    • http://sarkar.ie/userfiles/file/53749577505.pdf
    • http://garmaclima.com/uploads/ckfinder/files/70405972755.pdf
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/pazanegijoreja.pdf
    • http://ergakiland.ru/files/files/38942398758.pdf
    • https://kolegium.inaheart.org/upload/files/11643896824.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb7f1605c---lomewevobezogeseredokeba.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ca43c4b2b---28838822198.pdf
    • https://bodymason.com/user_uploads/files/vimedujixotefiwo.pdf
    • https://transport-vehicules.fr/userfiles/file/joroxodunal.pdf
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/50127071117.pdf
    • http://ahrestygz.com/userfiles/files/20210918_132039.pdf
    • https://lawrenceyezersky.com/userfiles/file/vetapozidozoginir.pdf
    • https://premiersuli.hu/files/files/48800114341.pdf
    • 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_off0000e120.bin
82d5b663fbbdd17481386968d07c972706f946172fcadd415a35bb63ed0720d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 10724 bytes
font_01_sfnt_off0000f9ce.bin
2dfac71a2b856a7b3f02fcf69fb7e425815cc06123f90823169909fff7eaed52
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 18620 bytes
font_02_sfnt_off000129fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129FB 16792 bytes