Malicious PDF — malware analysis report

Static analysis result for SHA-256 d128a332b0786ab8…

MALICIOUS

PDF

89.4 KB Created: 2021-08-06 10:59:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9a5db9b465b57fefa9fce9a7ba9790b2 SHA-1: e291bfc52f3fe3fb0d02aa52f5b637efbf210b1d SHA-256: d128a332b0786ab8c6d5aeeb1bfb9caa307aec8ce8c1d524c0d0c37bf2d0749f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely intended to lure users into phishing scams or download further malware. The presence of these links and the overall structure suggest an attempt to exploit user trust through a malicious attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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 https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a166bfeb1d2---46284153041.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160757755517e8---71420856709.pdfIn PDF document text
    • http://ktcz.eu/files/files/vopolifavomor.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/46198591092.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cd415971e---kokopejiwanuvo.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc248cc8a941d94e63bb007186ac6c98/16384531842.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/86682682036.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/1d92a14907fb649705a823a74bc52b60/sejexabakinuse.pdfIn PDF document text
    • http://velisend.ru/photos/file/nudanawuwitonabaleveki.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c347e8ce5c3---53823082164.pdfIn PDF document text
    • https://mytopics.it/uploads/file/31141974412.pdfIn PDF document text
    • http://enidbtwcreunion.com/clients/5/52/52e94d62e82ff66504c7d921fc07bf70/File/duzagadarelori.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608a176039b88---88025911615.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/mogoxumojajinoviw.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/pr84hl9s7bmehokm53fsm2pb55/53410907688.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/8691687291.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/43486916147.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d7moa1lajlmm931n9rqj3hhi61/89245364122.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/e89098ecb58ab9ee33e8d452404cbe09/97925909733.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/70sp4i5ar5rbb44u5htf7apm48/84293348870.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/75ce2ffabb9fc9492bab519a0738a726/fokubosepekugibititalaje.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/bimulesumaziduzeruvoxuj.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/2489778223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+price+silver+dollarsPDF 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_off0000f4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 19296 bytes
SHA-256: 5e04b9af550070d0d787b9fd67139507610b482aec08d8d326a7f793deab6621
font_02_sfnt_off00013dfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFE 10548 bytes
SHA-256: e9ab2c14a9d089156242c455b1d4c7e64eeae72e3df6b7417967f81084789eed

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