Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cafb953e430580f…

MALICIOUS

PDF

103.5 KB Created: 2021-08-14 15:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 99f2e0f92a6d91beaf023045befcefdc SHA-1: 2e84f736f1dcddbb85f10d3d38b13f4c6a0e0e26 SHA-256: 1cafb953e430580f24e57be4816cfaf08c3db1a6ef2d4437f1371d624ae423b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. This suggests the document is designed as a link farm to redirect users to malicious sites, potentially for phishing or malware delivery. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://huntic.ru/uplcv?utm_term=feminist+literary+criticism+mary+eagleton+pdf PDF link annotation
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/e46027cfaa4e34e97eb6e387c2e1d28d/garuwuxibodafide.pdfIn PDF document text
    • https://negaratoto.com/contents//files/sigiv.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093903ec9736---nezuromaloxovatokigomebu.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/dd8341075a4e6f45261e9d2a574e2581/toxasozalureza.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/gaxulenajalu.pdfIn PDF document text
    • https://schmitz.cz/res/file/gadim.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/zeworesipulepubesosapume.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/57d89f7aa47c98d8c5d9031be17fbfe1/96501964419.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021072706362880554.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/medixe.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/gumetodopadinevizagit.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/6jefv1tjj481partnubegb8772/zedavixoxuwubutozazam.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/76167529571.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/zedasojomox.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9edd88f022---97291092965.pdfIn PDF document text
    • http://bscsaoner.in/ckfinder/userfiles/files/gibonesikuzapamole.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/77542291461.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/iubha2a6s9b3gf9e91s1398kvk/4097977637.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/14rtj6detf913hs39kldkvci53/pagafe.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/bamowusug.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/29996099329.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/f82p0dd01hq0tjiabnfpm0fl93/4208822342.pdfIn PDF document text
    • http://allasclub.com/campannas/file/46551643211.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867286f3794---14846176278.pdfIn PDF document text
    • 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_off00012b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001439b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1439B 11052 bytes
SHA-256: 17b6b493f80f42d306be64e2891d4045c2521e32bb9fd3a3b56ee8aa9a437de5
font_02_sfnt_off00015d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D22 18848 bytes
SHA-256: 08181f49336e685946c309ea05e8b2d471d14aba2b69e275658be51c0e36388f

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