Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ff31105330ff6b…

MALICIOUS

PDF

86.2 KB Created: 2021-07-05 21:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ec74eb7beeacf85a472fd0f4b2ce626a SHA-1: 0cbc4c7f8d0c351e5d6231c25954a13732691685 SHA-256: 27ff31105330ff6bec792c56cd95bd5a47ed498c09567eadeb968ef2722a36a4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body was unreadable, but the heuristics strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/70d04623a1899d623896d1819f87bc13/86284493118.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2300a10995---dasaxedawir.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/rmu8m7kve98gga4kflls5eemac/diremawipugefazoto.pdf
    • http://rustproofingottawa.com/userfiles/file/66146331978.pdf
    • http://stellamaris.cz/userfiles/7781005938.pdf
    • http://ahkjt.com/upfile/file/ponizogofinuvax.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/11anbgqmm76oltmrpjjogqia8j/teton.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/74342021272.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6c54818a9---24884891.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa51bb688---18354870824.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/can6mpd1trd10n417djkbc2q0s/47357829069.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/6s3hkm1mliu6kaq7ie4guq65u4/62577139600.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a3bb3b590---polebixatop.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/ruvksf24tvk7oa1jb7hhchnr87/16771751280.pdf
    • http://banghetretruc.com/media/ftp/file/neruxajedikomadajibux.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609caa4eaccc7---86467812655.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c5528cd63---63096042085.pdf
    • http://bundoreh.com/fckeditor/files/file/zenepax.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/93ea7dc1139768022842c27c96d29db2/94852902617.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/p0j0ii39bf5s5jkh7griuiiqbs/ravufiwuxaxurolukeza.pdf
    • http://rockpapersun.com/upload_mce_image/file/50350941139.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b385125b591---fowodeliwufap.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608133e65b85e---68809528149.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e0135e33a---begetejepoxoliwalikepi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=a+comprehensive+textbook+of+obstetrics+and+gynecology+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_off0000eba5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 16792 bytes
font_01_sfnt_off000103bc.bin
3afc334678f78e8d6a773f4df26098df4752364f5270b645b445c0a0e89ea996
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BC 11564 bytes
font_02_sfnt_off00011e9f.bin
ddd3974016c8a38e3afc4bfb56e7b583205b5a9ce46faa5c69bfd6afd11f65f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16804 bytes