Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d2e89c114fc601…

MALICIOUS

PDF

85.6 KB Created: 2021-07-17 02:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9ee811738b3fa48d1a4c154c77f1213 SHA-1: ebcdd14f5a290f63e84a0024c476ec940fb6ef40 SHA-256: 91d2e89c114fc601720187d2921e1779825fc9031064eaec50705fa6d261e297
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malware or lead users to phishing sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://woods-china.cn/ci2/userfiles/files/20210701010936.pdf
    • http://sumisaedu.com/FileData/ckfinder/files/20210707_23540A86523FDF4A.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad91868edb0---mobumajozoze.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/a7c2df21de99afc7357da72a28f7bdb9/delifofonixagexezugo.pdf
    • http://mopi.eu/ckfinder/userfiles/files/83259432828.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45f0972155---69646872245.pdf
    • http://bishnutoursandtravels.in/userfiles/file/99941177608.pdf
    • https://stillwaiting.org/userfiles/file/reloxofazawudikomokep.pdf
    • http://safeabortionnepal.com/userfiles/file/20735390599.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/68nvvbgldoljg5lb185nnk2jf1/tinadozuxaruxeja.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b0e95ffe3---zaxilagilerulukuxaso.pdf
    • http://megalabsrl.it/userfiles/files/6020273882.pdf
    • http://brenna-ski.pl/userfiles/file/nijurasezirifajemupiwe.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/2fa082c13c2ac0cdf623e97e0b0156c8/fesuxirik.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/20763895895.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/rnc45rdgmcsu503vqnrfu73o7o/33384896994.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/re37cpn7ili099je8loooch3od/82261558472.pdf
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/5ade0e006ec305b1d28533fc134ce343/26550019557.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10912ae3b---jurabumulogazadizipege.pdf
    • http://staresecurity.com/userfiles/file/91188183992.pdf
    • https://ascinfratech.com/clientprojects/trading/file/28470134522.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be797362893---92352107908.pdf
    • https://samowar.me/upload/file/87014249491.pdf
    • http://verduciautodemolizioni.it/userfiles/file/77877364148.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8096cea41---tujopuvexalasobaxukelax.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607130251cacc---fanegejakavoxi.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f463210e73---97016348103.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=ff14+gold+feathers
    • 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_off0000eab9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 16792 bytes
font_01_sfnt_off000102d0.bin
97a3a5aaa7374e0a59611cd23533552cd39b679271feb65a51736abe4df8860b
pdf-font-stream PDF embedded font (sfnt) at offset 0x102D0 10544 bytes
font_02_sfnt_off00011ad5.bin
9f31504791e9445d5e34223565288582f0cade786ed12affc234dc4d00652741
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 17700 bytes