Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab39c37e67bdf4b…

MALICIOUS

PDF

87.3 KB Created: 2021-06-26 00:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44f760f9ea4b70c78c13ca1d2cd46130 SHA-1: e86258606e270d7f439adfe37ca6c11d3282af8c SHA-256: 7ab39c37e67bdf4bde96fb51f48c5b4ccd95aacc09063d59c8c98ea876fb4ae6
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple compromised CMS upload links and disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc76788fcf---nulidixokeniraw.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf294bcb2---82233909441.pdf
    • http://lso-msm.fr/userfiles/file/didapanunutozonawop.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/e19ef75c42b953880f257c97d0f8d755/jebipisumejoluvejizidad.pdf
    • http://dambi.pl/userfiles/file/sunanekerirofonoxazela.pdf
    • http://fygl.net/uploads/file/061143063620.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/bgq7l193ltucu7o3c7ksnog8f6/92708411381.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/pnac7hl3mnc56es27mljj82c1h/70342960459.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4ddb7b82b---metizemomeroka.pdf
    • http://nage-z.com/ckfinder/userfiles/files/14985617600.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9506321629---25054564082.pdf
    • http://playbabydoll.com/userfiles/file/bebubelunuvojimugito.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160749584ed0f8---44839105772.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608deb055d4b4---32427885306.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/976e0109bc24f84ac4685d10396496a8/27530442152.pdf
    • http://dajuicebarus.com/uploads/files/43355820978.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vg1ac4nvoqkckrlvmb1h1v6h6s/82818619735.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4663e91da4---xumezemekejinoruguramede.pdf
    • https://alternativecarrepair.com/userfiles/file/kugadunijazeredugogexali.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984cf5c6f79---nasoxusire.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f5aada71ceb759b3d406eafe913217b7/mowujaxagusixosubogarixin.pdf
    • http://cocoal.com/uploads/file/87161119463.pdf
    • https://responsible-tourism-alliance.com/content_file/files/21660976809.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce0d940af7a---pilosexu.pdf
    • http://btc-ltd.com/upload/file/salop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pressure+canning+stewed+tomatoes
    • 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_off0000f0b3.bin
26a87bab97c0677536519091925a0007ccad62cd22195a1e92b794e93672c2dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 17132 bytes
font_01_sfnt_off00011d34.bin
62b07e6fcca9679067ef1e6c17f06a9e70bbad4f477b5495fec29728fb5ed5fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D34 10852 bytes
font_02_sfnt_off0001362c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 16792 bytes