Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffa8abd9f06faf01…

MALICIOUS

PDF

116.8 KB Created: 2021-06-28 20:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 34a4fad25c21b3ecd1ab2ea24a7b96a3 SHA-1: 4f2bc6cd1c722e98489f98f6082bc535b1d385c4 SHA-256: ffa8abd9f06faf012424d381fedc01396dd67f28d78f19205d30e99b45bb0c43
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress upload directories and other disposable hosting. These links are designed to act as a link farm, likely to distribute malware or facilitate phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent, with the primary goal being to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f02360d0cb---rolewapu.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/fadokititiralifelaj.pdfIn PDF document text
    • http://allasclub.com/campannas/file/kegimufugubixiwedusaba.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ac3fab303---87407594829.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/ef6145dfb3c9156dcb9c21ef678db950/livumi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/f676756b2db347075176017ddbc55bd9/zubuselutitagiduvotemug.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cece9e2da50---98666690113.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607395bc5f10d---pitojaraduwi.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/cb73153508778ec927425ef5784e3bd2/vekexejidibajajoveta.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vivekutafiwe.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4a60838e5---62400422481.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106080435568942.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wunugesasawinutuvefopotej.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a802cb38ad1---62410873532.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beee3497fb2---29050517476.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd72e13e3---wuzelazuduleduzefubofuju.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021051803511473499.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/6ef2595a444ec64b0e1a3b09f4470fbc/fikovuferakujebivinufuf.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160890fcd096b5---61669967381.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ed19c12b2---27463269346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=new+england+sports+cardsPDF 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_off000164e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E1 18620 bytes
SHA-256: 7d1b6e2bfc579281eb65e4ab94b13849f279b1b5ced50531d3049b6a1c95b9ef
font_01_sfnt_off000195b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001adcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADCC 10660 bytes
SHA-256: cafc993e690a8b7afc62ed02fb5d80d013f136731eaa7ffaeae21054dfd5ac68

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