Malicious PDF — malware analysis report

Static analysis result for SHA-256 b226d224cf925313…

MALICIOUS

PDF

73.3 KB Created: 2021-09-25 02:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9bcf756ebcdec5c4dc78f341e19839e7 SHA-1: 8c5e51491ccae5eeb9c29b3bafb7a6df7f8e326f SHA-256: b226d224cf925313620b7580177ca42e144cb32460e9d006d59d0899c73fe991
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=stream+snyder+cut PDF link annotation
    • http://makesrealsense.com/ckfinder/userfiles/files/wujup.pdfIn PDF document text
    • http://jonellchem.com/upload/files/49781038080.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/373227593099ed9f535e9d8623ec943d/wimomonawavajixi.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vujuzafujizemawalume.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zimunewupirisajurorug.pdfIn PDF document text
    • http://dalaichau.com/files/zoduf.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/rorenenupotuxefowef.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/wuralabozebol.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/8845020783.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/84533238798.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/j04u6u2c1fn62rq45aq7qlq77m/61179328694.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/suzuluwasiloser.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/fozelijerijutotakapuse.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/94707628823.pdfIn PDF document text
    • https://cargotavio.ru/files/file/kuwuwarusijeva.pdfIn PDF document text
    • http://askaudit.ru/price/foralotivesune.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/vopixogekusabubapogadezis.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3d5f4ec041919e0c3c9a60a5e005a0cd/tezikujatevarulumupomeno.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/vko60viss490uu4najbmm6nrb7/37670372111.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/toxatiliwaralozibedetunos.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/24866060777.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/92051929017.pdfIn PDF document text
    • https://dm288.rs/slicice/file/67967891409.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/dabexoxowuzega.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB376 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_01_sfnt_off0000bc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43E 16600 bytes
SHA-256: c00d74c69b9fa6b8252e9e9e8cf2015ac3d072fa73d7f7f0093b2cd3edc55dd7
font_03_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10564 bytes
SHA-256: aa6801db3b396614ca0a442a814c5603abd8ae20e3b1a941eb2f5e178de9517a

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