Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90b28d68009079b…

MALICIOUS

PDF

81.8 KB Created: 2021-07-18 02:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 22211296bf513bd9637d957659ca7ad7 SHA-1: bb07122385cf60cfaa77b5e8d23bc384e6d9c1f6 SHA-256: e90b28d68009079b4a54a58b5d59143871f35d26433194db056b0823f22a0afa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c8b74393f4a2f8df76a68e8c9c71b2c5/tekuriwinoduzazoxumosim.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6fc10214d---dogiraxolorewurudawapereg.pdf
    • https://hogozaty.com/ckfinder/userfiles/files/juxiruzeda.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cungnbcj432lgh9l42k9bbiv7h/28832770531.pdf
    • http://stlukesmn.org/clients/17773/File/sojokebawiv.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160983e1ebc2bc---xukimikutogabolomajop.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160832e963773f---navowapajor.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9160619bb---61926930214.pdf
    • http://afgventuregroup.com/cfiles/file/xemasugoji.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/dipa1bebj9tafcgdfg7at0000k/31427875716.pdf
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/bolonolojawemiv.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7cd2c1f9f---47081540659.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/cb7fd29636d8355896b820635984a420/70310042895.pdf
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/siniwalutedekagalikosowur.pdf
    • http://avs-market.ru/admin/ckfinder/userfiles/files/mosibufijepigozefebegemo.pdf
    • http://saptpadi.com/files/file/majanez.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607108c04286c---23765679733.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7154a31328---tijokofudidagopo.pdf
    • http://vandientuchinhhang.com/upload/files/jikomujerurewa.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d60446ac67---49614690734.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/ae12dc2f0b1b46b23fe3bf6674cdc1fb/70974820850.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c22c54512---96968713697.pdf
    • http://sonsuadogo.org/Images_upload/files/zizanixu.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/et62av2hjtptoaqa64rk400gm0/77246019162.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+greatest+number+of+four+digits+which+is+divisible+by+15+25+40+75
    • 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_off0000d52b.bin
5b91d649dca6428befa4d0f86c2d48e92a6216917248a49087c9dfd42be84dfe
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52B 17944 bytes
font_01_sfnt_off000104c6.bin
317e09d54fa6a3a68f2c495cd22338bd7b63e71a4352880e5cbdc048717fcf4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 11948 bytes
font_02_sfnt_off0001215a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 16792 bytes