Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad07eaa8827b01af…

MALICIOUS

PDF

80.0 KB Created: 2021-09-03 18:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef1d6f95dffde9d848f6caabddfb2c66 SHA-1: 6d7f878f46ac103154533d5673b4b069efe917f2 SHA-256: ad07eaa8827b01afdd75574a90a279f8a40f7420d50c3d17d7a0fbe199d9f170
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/d43ed064a82cca73b405fe14a45e61a2/76832525312.pdf
    • http://wksx.top/images/userfiles/file/54959870401.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea304de01c---wotomezadimo.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2149027ffc38b4f2592b092cb9205445/80046564313.pdf
    • https://subarini.ro/mm/file/perufokalab.pdf
    • http://eotp.info/sites/default/files/fck/file/vaditexiwu.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/i36e3g479cs95v9abcgmkbukb7/jukitafagakulorakitolapi.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ba706e1f5---sitonozonatajujuvap.pdf
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/16885814965.pdf
    • http://dansecyr.ca/pdf/file/52446664329.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c14abd57c6---nilogipupedesavoras.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993e83c81d3---babinotefubejas.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26f6578064---68067944587.pdf
    • http://kiapelhrimov.cz/UserFiles/File/guderin.pdf
    • http://change4best.ru/upload/file/narofosutifazufojozo.pdf
    • https://carcable-bg.com/uploads/pictures/files/pobubijizeliparumoba.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9933dd3f0---negikolebegi.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2b7f3288---31440995209.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8e2cae86a---15409120117.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160cee23c5dbc2---18102672237.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=rhetorical+devices+worksheet
    • 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_off0000d4f7.bin
d42aed2044f1c41a8e034f4b9da128889205106f9e2453dfb20d313c00c76f24
pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F7 17748 bytes
font_01_sfnt_off0001024b.bin
142a0ed13258d374b0f5c7770d10974bd02a92ad6b622db8fdff60a0599fddb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024B 10652 bytes
font_02_sfnt_off00011aec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEC 16792 bytes