Malicious PDF — malware analysis report

Static analysis result for SHA-256 a05b1e7dfcfce70c…

MALICIOUS

PDF

130.8 KB Created: 2021-07-13 06:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7c7242f71bb8bfcd479508535cf265fc SHA-1: 6ed6b1e8fec4434bf60a5bef5126d48313911567 SHA-256: a05b1e7dfcfce70c2ceaea3092def20ac245c42a783ef0868f4eba048e0ae375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to malicious content, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique. No scripts were extracted, but the URL structure implies potential for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://oniceh.ru/uplcv?utm_term=full+sex+and+the+city+episodes+online PDF link annotation
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/09a9c53985748a547887e76f43a463a9/rujowofipukipedeb.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d4350cc23---12333951257.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/fe60bbc79a9fe57d26eb82675c920a41/pilobuxodakif.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35e4cbcc64---nezusa.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xekifulosukageminixi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775785e6956---xexeberomo.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/27336794999.pdfIn PDF document text
    • https://aokman-drive.com/d/files/guxeguw.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607a70c55bbe9---28846521709.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/d050c99475cad887b81caf1b062aa211/deduvawifixerebe.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/viromexas.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/c6aef1d6b3174450398f2010a5b68161/pufasibireluponat.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6bdab0861e---dunuwoge.pdfIn PDF document text
    • http://apvn.info/userfiles/file/naxazasobun.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7h6s0uf80i8lkepmtmk3knkqbr/44864572865.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/turnliuu3s3k8ul7tg527ttcqp/88736890643.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dc83b75e5---24785485125.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c963aab335f621beaf7d19a5273aa43e/walagi.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/29472319018.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082acf5f154d---63042407786.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/906500f8e058937bbc8bdb0830055406/bidomofopow.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_off00019dfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DFC 18072 bytes
SHA-256: 6efece3b0bc11c1b9291349d15d4193bbee6f8b59b8bc5c7cc6957d65dabbc72
font_01_sfnt_off0001cd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD29 10804 bytes
SHA-256: 05c3617caadd19ebee9f075453b2c4362532bc06f87eeeab0328cf4d4cab4ac3
font_02_sfnt_off0001e60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E60A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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