Malicious PDF — malware analysis report

Static analysis result for SHA-256 c085a358e42c0e71…

MALICIOUS

PDF

82.7 KB Created: 2021-06-30 16:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dcc6e0ba65a886be2c3a77576636576f SHA-1: 4994a741bd2b786793f4bdbedb42fb35a5cad440 SHA-256: c085a358e42c0e71284a87aa3437cac4e7044d4ff24ebaafcc570042ea20595e
156 Risk Score

Malware Insights

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

The PDF contains a link farm hosted on compromised WordPress sites, a common tactic for distributing malicious content or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the heuristics and URLs point to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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 http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dto4iq09u2pcu9u8bvk76qmv73/4867205014.pdf In PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac3ba31d0---bexijuxapujemuz.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/bopirijitomad.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5a0bafd1---464584321.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160784e0fd1915---tipagewofeze.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608623cee7b87---10306747619.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/74994897434.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/54ae65f9df61e12ba5c813d9723b41d2/famivaguduzekosolevena.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ff13b61889db72f3ca3b10e767958ece/44152377491.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gifogimovu.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210607004232.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/daqmdmt79b7lac3a6v84ee2686/sepaxusolatixulepu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d3c48fb70---fobufewiregulurabepuku.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/163135b53166d1f15e5d69609b5fcb05/15307438890.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/daxubigivikotizurojor.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210615_1F115AA4B91C0483.pdfIn PDF document text
    • http://minerva-collection.net/files/files/11456653897.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/99844462882.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f27ad3bb3---43708437701.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608514464047b---36405340455.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/dd8e7b6550aa21ebccfd17fd2d379992/17522119290.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/jebiju.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf10f7a354---nasulimimolikomag.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a306c53f229---samaben.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/luminipitewewupuf.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/17271774494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+all+about+the+benjamins+putlockersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC764 16060 bytes
SHA-256: 2f306665d4631bf5729dee2f35834acca0f59e1db4db562b112de954dfadcfa4
font_01_sfnt_off0000dc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 17088 bytes
SHA-256: 38f19c56e60605fa07854ea7463ade27de7feeebf09fc76002ad90e56d741903
font_03_sfnt_off000121b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B5 11096 bytes
SHA-256: 125d01facd8d3c0d4c214ed74a164b8471024e2994062905d14fa436387d71b2