Malicious PDF — malware analysis report

Static analysis result for SHA-256 31fa27ad2b62b4a5…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31736f71de931937d91c9ba4564aabb0 SHA-1: 3ecc9d3e5f93fe8570a4815a7534f736f3f0e572 SHA-256: 31fa27ad2b62b4a5a9da5c12e204943cd1468c577ded3ecd4bb65486f1a3807a
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 and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users. The file's structure and the presence of these links indicate an attempt to distribute malicious content or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/dbqi0sukujg75gsgvstuqkpnd9/52220464843.pdf In PDF document text
    • http://elitvorota.ru/f/file/xakegugesetedoxajon.pdfIn PDF document text
    • http://15881588.com/ckupload/files/36663990933.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/694562db50dbc3862c2b7755edd85c3b/37197982079.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/89666837967.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/91461493731.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/ferovokosobu.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607343aaeaa73---gusoputeruxukutunifexex.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/07/file/16423568823.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/cqtlsofvtmm096hfia94hn0r60/lapavupekejawoxegazoliz.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbf93d4647c---52502134887.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/55081853352.pdfIn PDF document text
    • http://shiokuda1.com/contents//files/diluzolubawavobededijojox.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cce16bb40---9756111527.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/2d5e5913dbfa424d92cbc4de33950558/birofovola.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/31634a7fe34a58ffd31b4b7c883ad6bf/98753854619.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/671505dbee532252a419e5b10918f2d6/nekezavirazex.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/98908693542.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/dugipililenotufasemofije.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/kewumotuvojukeka.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/22269090642.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/68601249364.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/99451052547.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=modal+verb+lesson+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_off0000e831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 19752 bytes
SHA-256: de9a485b65723bbb41ba4bb7d0c096f81dc0ac80781d69e23107a9a9edd9bcfa
font_02_sfnt_off000132e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E0 10500 bytes
SHA-256: 9ef1a8e62d461744c51b9f489822a64a90036add2dab331f20f76c3ad02bae13

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