Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5054aa78095a3de…

MALICIOUS

PDF

89.6 KB Created: 2021-06-27 18:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 528a9e4f3527d96f2c630ead043237b4 SHA-1: a0aceff6fd0caa16dc14e776ad459fa490a2fcce SHA-256: e5054aa78095a3de8575de9c46987329206d0f5b27473748a8e326a8d89e2833
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or are part of a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=class+10th+sst+sample+paper+solution
    • http://aelma.com/sites/default/userfiles/file/83121322708.pdf
    • http://ashioke.com/images/library/File/kixeraxenuputa.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160745e475b862---bazulobumesixenebori.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16094017d6921c---miwap.pdf
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/xugewabo.pdf
    • http://shreejians.com/userfiles/file/80589077999.pdf
    • https://adsbudget.net/userfiles/file/rivedinero.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/65186169719.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607d93a66a9a4---votagaluzigolatedowakaw.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/r1n2kotm73kj3q9b04dfom273s/90975806567.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03da54a5e8---57212345074.pdf
    • http://pc75.net/upfiles/file/1623260289.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/dd0a19b2d7556b8144e6303fb1c25ca3/pipeneledowuluwup.pdf
    • http://rebizplus.com/userfiles/file/nikebatuguxujukejalatilud.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072fb5288f1f---29342973534.pdf
    • http://hongdacable.com/d/files/68230875950.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774832c04ac---xugopipibefedu.pdf
    • https://habrit.tw/ckfinder/userfiles/files/82246086771.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ehvv43v2l4i4n3sflitehiei4v/nujuwatogotowogenajo.pdf
    • https://abhimaninteriors.com/ckfinder/userfiles/files/zafise.pdf
    • http://erictex.com/ufiles/files/64847547651.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/laduxediludolos.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c577242516f---87822836004.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c7039b00---tepaxurukizurirowafit.pdf
    • https://bucatariizidite.ro/printuri-fi/files/50301736505.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_off0000fa37.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA37 16792 bytes
font_01_sfnt_off0001124e.bin
642afeae07551170635dadf779a6392cb4f6c2228de3ebc70b641b05cf77be7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 10824 bytes
font_02_sfnt_off00012b14.bin
bbc0e1fffdc8517365af28ec98eeb336edb80666ff925816c0b59f1ae79afda4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B14 17424 bytes