Malicious PDF — malware analysis report

Static analysis result for SHA-256 381ff94347e306e3…

MALICIOUS

PDF

96.0 KB Created: 2021-07-08 01:19:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de30f5210670efd9a83409f873d98044 SHA-1: 2cdcc7d3ac4d6d83db5bff5396b73ce0f5fdabdd SHA-256: 381ff94347e306e33f16a11b664cdf5522eae8561d3fab2fd9570e23c962d45a
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 numerous websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nenkin-t.com/upload_img/ck/files/nasosuvedimupagofovazo.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089ca0a60d25---folemuvizinex.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd598d4e4d6796a3df8b66de44f448a0/47375406650.pdf
    • https://susta.vn/userfiles/file/fudazoxup.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c56330d6ac---34742931017.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/rj7mg7sfb5bt2kgg7k5a2vfva1/45712465756.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a9a102c3b---zuloxawegixivek.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d37aa803a---47913561757.pdf
    • http://1975geegees.com/clients/78603/File/kodegez.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ae56ac0b42e71abb6f7a892cbf7d4104/firegobawabosose.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ji31vctcof9j21jtmoodnoe47g/59192746724.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b13d2c22c---jejopod.pdf
    • https://samtee.com/admin/images/file/14029371674.pdf
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/somaxuxovarigejilafep.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607210cbbfed1---xosozekidiletufupebo.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16092c8ed871f5---labadovub.pdf
    • http://status-go.net/gfx/userfiles/files/tilagivijawazojijitanij.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5173ecd9---15829222404.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160836c3457980---jebaxupafo.pdf
    • http://high-keenltd.com/userfiles/file/74622414673.pdf
    • http://pogotowienaukowe.com/Upload/file/36752641347.pdf
    • http://syarmarka.ru/userfiles/files/96490164795.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a463a101207---wubofeda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gaslit+in+childhood+meaning
    • 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_off000115cc.bin
e0bf3bb6cd8033e7c2215be42d5b96f6feaabc23c193543e8702a9663619eeaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CC 17060 bytes
font_01_sfnt_off00014238.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14238 16792 bytes
font_02_sfnt_off00015a4f.bin
602dd81551f398ffa51fed1c0afa2ef74e75531da0af7b3cd7f8344d31b4a24f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4F 10756 bytes