Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88a8579e7176ae8…

MALICIOUS

PDF

79.6 KB Created: 2021-09-05 15:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b44593e7a643b6b29abc027bb07de76c SHA-1: 94ddee355c9b75494645903323927b826e98e215 SHA-256: e88a8579e7176ae84975652eeaeb8ee9dc78b7de9a9a26c1bf42220fb8b282d4
156 Risk Score

Malware Insights

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

The PDF 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 WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161201ebc1fc29---rarebuwipidine.pdf
    • https://asiquim.com/ckfinder/userfiles/files/10566821667.pdf
    • http://ambulatorioveterinariocamali.com/userfiles/files/379756565.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/029f356a3e7f4dff554d745a2cec0167/votabuw.pdf
    • http://teplospectr.ru/images/files/xolewaravasiguwupowedusor.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6414917374---96310236476.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/93342649df82e665394900d47d0fdf45/laretawezudil.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160db065168ec5---66671046229.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5cac70105---gowuvuk.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mdv23t77rmsahihqpv7ek66npm/jorojibebameloke.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/bd78050a869b228610ae259ced2d25b4/76496628306.pdf
    • http://luatsutiengtrung.com/app/webroot/uploads/files/65990467388.pdf
    • http://webinaris.biz/ckfinder/userfiles/publics/files/saxubixig.pdf
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/xapuw.pdf
    • http://hopkins1983.com/clients/861771/File/torunibeji.pdf
    • http://tandprotheses.com/ckfinder/userfiles/files/tizokumiwewuvorevusun.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/rofonuwefedowojemesegonad.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13a06310d---74114422389.pdf
    • https://cgeminfos.ma/upload/file/30155307352.pdf
    • http://geyikkimya.com/userfiles/upload/file/rewuvisopuja.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/9fc4017881eadcdb59a4f4f8120d364f/nisugax.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/416f8d8076b05156dfc61e03c791e6fd/butopudasukibetivapoku.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/f0226fac2f77e6effd7407270ffdfa4f/xutogonosaxisi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5fb10a44b---26672258933.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=panasonic+lumix+fz300+manual
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612707ac11c75---xakaneraxetuxixoluxe.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_off0000c9a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A3 16792 bytes
font_01_sfnt_off0000e1b5.bin
15e13cf079d71e965f3011340f3b63cab32382c3ca15b3fb23f730d5864cbd1f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 20608 bytes
font_02_sfnt_off00011873.bin
9761a2bcf44a56a752b123e640f81f834ea8bafb1a070f1eed200a1728591185
pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 10724 bytes