Malicious PDF — malware analysis report

Static analysis result for SHA-256 175113b381bb6aa8…

MALICIOUS

PDF

82.8 KB Created: 2021-06-25 14:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4384529cd0a9c1d6c908ee64cb29d534 SHA-1: 0d93fa766b32c8338b8373037912b83a6e239386 SHA-256: 175113b381bb6aa814e5bda119e2d4cd3dab7e765016d482e5fdabc57af6f20f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, indicating a phishing or malware distribution attempt. The 'SE_CALLBACK_LURE' heuristic suggests a callback phishing or tech-support scam pattern, aiming to trick users into interacting with malicious links. While no scripts were directly extracted, the presence of numerous suspicious URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adfa3f3dfb---61096817760.pdf
    • http://alnadaoil.com/userfiles/file/56329310537.pdf
    • http://rzn-house.ru/upload/file/bazekafikuxopifuzorifap.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f202070a4---farotezofuduzerebasaz.pdf
    • http://wisdomtours.net/upload/file/siletatefiwagamijozu.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083995cc13f9---zajenizozoke.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27416cd994---36852758700.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c782b88a6a4---vajinopuxefu.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/fb6f6077a6da2aa16fda0d60adb27641/69012592160.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869c5eed35f---jidakikuw.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da7a08c04---devafaxosefuzul.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/20f3d152b3844597560d93ebbaa28b25/kogijenaginowutubawimo.pdf
    • http://austria-ex.com/images/blog//file/30940274987.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bebce4cd854---jaxasatafegaxilari.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=keras+loss+functions+for+classification
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f518e0b0fe7b744c5b2b66937eb675fd/luxusosukifexa.pdf
    • 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_off0000e263.bin
de8c6daa29b3b26d4f0b7c21b677260e04a47bdd64b342d84013b233a16e1412
pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 16712 bytes
font_01_sfnt_off00010e6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6B 16792 bytes
font_02_sfnt_off00012682.bin
ea25f9dece686f813cfa21f5cce953555426fecf064e4c2d4357d005bd8ab75f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 10420 bytes