Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f942f86cd6468e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-29 19:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 449e417c8083982d5f062adf27454569 SHA-1: 30d4c2f831c68b12f5a73fe8f2947de5a29d84c8 SHA-256: 46f942f86cd6468e4a892eb6f00a0b7a98ab2822316592dc644a21ffdfe20292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ln3uj1knrc547vt5l9egor0aum/dewigasaj.pdf In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/add0b91284ba3060b8ad0e3a397645d4/saxosuzi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8112fce421c912765cbf9be2947333e0/60574004334.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/944e72c3d28e6aead909ee1230c98771/92347708036.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/magepejomizuduf.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/2ad913b1f1a2aaee2764b33c97b78c4a/10036634250.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e89f089bb---depelixabix.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb355bdcb0---33930797243.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0ed62c88a---vujif.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/padivuso.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/fe6c729abbee3e7e2d10061a00b69913/dolabokimubododaga.pdfIn PDF document text
    • http://kamennykoberec.eu/editor_uploads/system/files/kofelozafelimenekira.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/444f6aebca4393294c28082e85ea11e5/98620721228.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/tqkbpqrr82bnku26kidbckjaln/jafevoxerusil.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/66863010179.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/pazateliwovosatemokifis.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec8f7beff5---38935902854.pdfIn PDF document text
    • http://landpas.pl/upload/file/36844874657.pdfIn PDF document text
    • http://sartor.ru/upload/files/18824354030.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/71011570946.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/02e3df4597d8ff8fdfdcdc7d6bd71d96/luzizesitozonemizedipixa.pdfIn PDF document text
    • http://goreskyreunion.com/clients/b/ba/ba087d28c24afe6c5bc45fa062332e47/File/43245098256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+are+the+six+historical+lensesPDF 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_off0000fcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDA 16308 bytes
SHA-256: 50fee787ae932fcaebc21c3c0a21d2c33ba69ee74958e67c47a8988b8e423b37
font_01_sfnt_off000126f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F7 10420 bytes
SHA-256: d8237d973c3467488b08536c0fffc97f8d6d993cc0a6497f743f6f255755b6e6
font_02_sfnt_off00013e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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