Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b5d9ed0b512c6cd…

MALICIOUS

PDF

87.8 KB Created: 2021-08-09 02:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 31149853c5ed97588b08bc0f0e2f2aa4 SHA-1: 6d8c051daba904a41a771ca7897cdc22a2f1a292 SHA-256: 7b5d9ed0b512c6cd23ec2c24caa44024a32405de09c16d73ffe2d5c876018e79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16096ebd87fa06---97057739591.pdf In PDF document text
    • https://noticky.net/akce/fotky/file/91971134292.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/95138133640.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/96gpksd43l1u772634f0rgtbo4/fokiwudapiruvokuliluref.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/sezedewilo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/7ha6d3i0gbja4oiafvv0l2fa9o/96289071514.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/pijosawidukuxevew.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/73cfd7928ec512c4185936114f804894/1396840300.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/dekedosalazubonozumuv.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160717efab510c---89259062734.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/7801603417.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/q8vj17peipnk7aokqn7pk5p7r1/79316198705.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/serudeladupaganarofas.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2b4003e4d3ec8b2f8ae2ff4f913b4b21/tofere.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/nelexefawed.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/86894455512.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/1jfd9lf2clmbr59m5486ub4o6s/vosevopijagabu.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acb5f744ce---jegamukopebebopawoxirare.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a87457e8---56025816987.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/dd2b6ae9dd589e8cf45efadaf218c6a7/93225084076.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/68865819282.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/94897731323.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/fusimujajotarawop.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/6sa76o2utm9kog8e5ttcflea5c/26656585086.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mini+dapple+dachshund+puppies+for+sale+in+oklahomaPDF 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_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 17292 bytes
SHA-256: 3db0f49edcf7f1f7fef3bbb39737e185c452781a7c655beeed0596967a0df000
font_01_sfnt_off00011fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB9 10972 bytes
SHA-256: e806bc6361a90751f3c7d3a5eaf880ded6c8febfeb56464b86ff37128e907601
font_02_sfnt_off000138ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1