Malicious PDF — malware analysis report

Static analysis result for SHA-256 d616a01dbdca8bde…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 07:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 732aa346b424652f8801a3debd9cd1af SHA-1: 89ed28b32d5404e44b1d203b8621db6bfe46653e SHA-256: d616a01dbdca8bdeeda0272bbcbcf750f5292fda042363292d003b9b07e63ddd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to external sites. The presence of multiple unknown URLs reinforces the likelihood of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/64531965088.pdf In PDF document text
    • http://poorclarescork.ie/images/59311356190.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1607174bccce4d---zaturorokegejuresitulovu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/nmi9ubsqkpd7j0evrrgiusj344/93577694168.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/boluxemik.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/ejjt27qffs12g0p2rof9esc1j5/vituwaxe.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/vubugamulopu.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/82779428825.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/nefidara.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b768cb22455---vuxov.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6a44ea55---boxapaligazut.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4e0e2f6c8297189a83dc30c2fdf3cceb/98802409866.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/mojasatojigijutix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7cc2f10f3---dilenonozenewesi.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/cda4e1c787b75c87a163230a5bf75c3b/kejupadim.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/jedek.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/78c2b45c0a4c0194b5675962f89b14f1/75881283740.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/20705720093.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/27/file/20210727_083933_192.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ch8hs9k1i6qkrcdfagpt50u0eg/96686340236.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6785dfecf7e81ad0bb43bfa5d315f438/45978394735.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/vifoxuvij.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/9443919137.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebeb1b2251---82030423880.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/875374e3809e0fdb9bba4449f6f649f4/rirolovoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=inside+listening+and+speaking+4+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46F 18500 bytes
SHA-256: 4237626bd3e2d6e0bf5004a52fa40993577869f10b69162da67525f2b76ee788
font_01_sfnt_off00010439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10439 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 10780 bytes
SHA-256: a82072b349b6c53068d4a05f09ecd0ff59ac0e8d4d9ebb5e02abd56cf978f600

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