Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8ae0f0600972b1…

MALICIOUS

PDF

83.6 KB Created: 2021-07-04 19:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a4e4b528dc9817f7873cbc66ac622486 SHA-1: b4c77b46c08678007d8b8f6e17a7347b5528540a SHA-256: 9a8ae0f0600972b15de785eda15e48b345c64488ceca6469d8fa707a7e57a00e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting, likely to host further malicious content or redirect users to phishing sites. The presence of external URIs and compromised CMS upload links strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/uplcv?utm_term=what+is+imbed PDF link annotation
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/nro4vbmf790oki129egcvtamc3/87115656134.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/tobajom.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/mefajimuvawikup.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c1bc7e972---97490850788.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/10230daca0b1eea902e7f585735e4f15/6237560828.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a33a02788ff---zazodomajalokobosugaz.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9a9cef36682988cf81e4a658600715bd/39863597931.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/92458089541.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/pogulelirakak.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b78e54d1f9---dizegevabijejurezi.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/03v4u8jp3njgmpv1hrl5592ui3/48794404590.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/geluwurofaxusi1620838052.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/gpe8ifve5luc43og7k7otuc5m1/kurukowatazovoxotetaligo.pdfIn PDF document text
    • http://runo34.ru/attachments/file/51244547249.pdfIn PDF document text
    • http://amdind.com/userfiles/file/xefisofidox.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082bbf51537a---sizuxukivefilopulo.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/86828337509.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa7b20a47---mepivizetelumuwa.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/4881194780.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e945b782cfbf4ef1cc0d4e97a75a969c/22367900885.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160992aca0e70a---91360290986.pdfIn PDF document text
    • https://zzhqhi.com/d/files/rojene.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/17561287606.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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4C 17488 bytes
SHA-256: 8222178ab12e6a841cbbf388e7800183586ef727bb3bf236e1c26658f5f50c2d
font_02_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 10276 bytes
SHA-256: 72ae65fa48b2a958bdeb031a8fcfcd2cf727ec1fe0029b901e909d97c4020e77

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