Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f14d50f600a1edb…

MALICIOUS

PDF

86.4 KB Created: 2021-08-12 15:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 493c9a23fba3f4a4f5c1724c90620bda SHA-1: 1d6a93bdf608a0c193b87bc54de713e1a3c85479 SHA-256: 7f14d50f600a1edbe1856c61baa0ec81533f72074badfdff31e27f062b29dfaa
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 CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly implies an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://toyotarenta.net/FileData/ckfinder/files/20210803_DF30C910BA467D33.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/runutikagerabiwudawoto.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160984a1bd607b---20634718510.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0kdiu5nmdqrldtpmhgndapat2l/95261741068.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/80fdf3f78e1930158a42d9031bbc7481/57205794377.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6su8egsmehqmijfrtloclke7i3/memomofobosagogetisi.pdf
    • http://gianniarnaudo.com/userfiles/files/52383587913.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6229c3077e---3089473704.pdf
    • https://vasantviharproperties.com/userfiles/file/dilos.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/82d6ceeb3a44af2b82d545e5588aa19f/xuvupisosa.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610343204b20a---2692163736.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c12960cf84c---43921732107.pdf
    • https://tspinstruments.com/cache/fck_files/file/fupabipexijowiz.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160895b2e08def---lujugiw.pdf
    • http://vizugy.hu/uploads/files/files/jukozafem.pdf
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/pozop.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/5ea28ce2a7683f31abd98dbc8a9f25ce/banemotu.pdf
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/7b38286b016ffcde95c29ac0a0b0fa1b/xefuweniwejetiwusiw.pdf
    • http://fsnmmaterials.com/UPFILE/userfiles/files/97859698283.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8cd9f077e---rawopozi.pdf
    • http://smit-electronic.hr/upload/datoteke/kufazakizakobat.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd8558892---ligodutamimewesatob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=game+bubble+witch+saga+3+mod+apk+unlimited+money
    • 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_off0000e94c.bin
4122705509a46a8921091ab6ff4f313e6876abf893a8bab01aeabca1a4f235fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE94C 18764 bytes
font_01_sfnt_off000118bc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 16792 bytes
font_02_sfnt_off000130d3.bin
54960c3c4f14ebc3334e3917b241992300f58c15cf3d1801dc751fea4e02a3c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x130D3 11604 bytes