Malicious PDF — malware analysis report

Static analysis result for SHA-256 41685ddff05c2d4e…

MALICIOUS

PDF

93.0 KB Created: 2021-07-04 08:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aaed12b01b51f756c44d89e30307bdb4 SHA-1: ea446c94705caf8f1fed303225c461a9c9796227 SHA-256: 41685ddff05c2d4eabf9822694bd92136699f51fbe4e87ab558f54f458d163b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to malicious sites.

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://crysiq.ru/uplcv?utm_term=how+to+get+san+andreas+for+free PDF link annotation
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/32vchmf7hoftk76usrljgp8gjm/15968624549.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cd6c4f9f---tudozozutedorotugejuvine.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079584cd2d36---64659209695.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/3a6f3f71d9cf962d96c731405bbb33ff/52932876438.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f52c92236---63379204645.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ced48773a92708f9e1ca47b6d224a347/40497836659.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca99745ed9---80515078440.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///39577783772.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1eb9a6e55e48fbb72f41f3a09cfc979e/17199438145.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079245555bd1---20238018824.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e19548f3---43220152446.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/xamigigiguzavigiful.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c9307cdf0---68173443080.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/96704312004.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7ira3duo91ps34sd4hq5n056vr/87938943037.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a46029ab3---nuxilewuzikixuxurovefa.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/83a4679f349a310578dee3326387831e/30832746245.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1a11a15b---nedoviwutakorafaxanamosa.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/fedobekukiposobabigatuve.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/29027245038.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_off00010845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10845 10468 bytes
SHA-256: e689bd5b22a6f651e97dd26e8a74837c02b50040ad4c2aae1bb9dfe5e102e7ea
font_01_sfnt_off00012001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12001 17336 bytes
SHA-256: ef527a70ec0246af85c24ad27346f8dc4996b8eeeb1b301a1b82a4657b26d702
font_02_sfnt_off00014d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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