Malicious PDF — malware analysis report

Static analysis result for SHA-256 261549e74fa99aed…

MALICIOUS

PDF

77.2 KB Created: 2021-09-12 10:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 85dbb66d1dbc8871bcb05a89b0eeaa57 SHA-1: d3e5371ea093f7befec68ba38c924349d72d3942 SHA-256: 261549e74fa99aedfbfa94659f732a23e664c0f123c618030b58c3990523755a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=can+apps+be+transferred+from+android+to+iphone PDF link annotation
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/mufawibunebizumimetazad.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/razelevidifa.pdfIn PDF document text
    • https://cncunse.com/d/files/56028032916.pdfIn PDF document text
    • https://strechybenesov.cz/content/nadalukipofavox.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109120601098761.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/69360561463.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9a6de41a11059132a0f943805f5aa873/sinizijulo.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/63066962798.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcf9177adb---rujefe.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/vugafemugotew.pdfIn PDF document text
    • https://gdaniec.com/upload/files/88675921734.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/busuxowibalazejadozavin.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/godokadofazotapagazi.pdfIn PDF document text
    • http://hzqzg.com/d/files/62975733771.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ed812829b---77723239915.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/dilikuzakisivugese.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/fesevarikisobugegetonime.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/77036887790.pdfIn PDF document text
    • http://ty-int.com/files/files/83672320769.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346dd5000bb---30206470614.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd150e568b---korojebamemajesal.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b41793d8d---xilem.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161311207028cc---jejiveselizevu.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_off0000c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 10888 bytes
SHA-256: 33acf1d8f14f83e0a839f3fb7654a8c072a3ca3c8d76405d47e2bc096fb8ccfb
font_01_sfnt_off0000e287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE287 17244 bytes
SHA-256: 07b6e1a264ad3d55edc9326c29a44f475dcf448e2e9b11027b3908d1228f419f
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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