Malicious PDF — malware analysis report

Static analysis result for SHA-256 f922a9d51f92b99d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-02 04:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 869852c1196bac4cf3ee1a0bbdeecfeb SHA-1: d1c14f12796da111b1a80f2b015d66523b86697a SHA-256: f922a9d51f92b99db512a8b7b6f2a46d26caf42bea1854f9e89696416ac78b50
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://investmentskillsgroup.com/images/userfiles/file/bomenow.pdf In PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/4fsd0dh72bg38o0nu5j5v9auq6/16157726985.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/ap0vfnlilldh1jhk4s9809rifm/80069002721.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8cc9bc271---wadefer.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/041253b8230ff6d90fbaec3b785459ae/18541575986.pdfIn PDF document text
    • http://qdcmd.com/data/files/14117544694.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/9300970978.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739aef6661b---91495184271.pdfIn macro / runtime command snippet
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609662dc4c57d---33872427309.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/57528923411.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073917324191---fubuladigupojetunonuv.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/80358187145.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/labirolu.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/730c596464636bfdabf29100fde411f7/nokawelibide.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd384a78a6---38361682210.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/7450760765.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/50041540894.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dbded8f09---25699862018.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbafb2cf94---nusasokotarekegorusedeton.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/06d0fb0ba6119776ccfd125f57ccb4a6/lemowawaxime.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/poluroxej.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/lunazibuleditinu.pdfIn PDF document text
    • http://efuturesthai.com/uIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=exercises+gerunds+and+infinitives+pdfPDF 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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 17272 bytes
SHA-256: 59b9407d29489acc9eafd9133c7e363d022bbcf8d7481435f073cfdef2ec9cbf
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 10880 bytes
SHA-256: 252393c1448bfcd419cb94c46a8c5184f26ff64caea6c0a6a7925f31e3872851
font_02_sfnt_off00011da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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