Malicious PDF — malware analysis report

Static analysis result for SHA-256 112a3366926c7adb…

MALICIOUS

PDF

108.8 KB Created: 2021-06-26 08:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dafe12a3a27893c8e590d893d096ce1d SHA-1: c5f73cb0da8436be29d1abe879757223c9316c01 SHA-256: 112a3366926c7adbde609e052aab1aa263cb79f90bbf35fbb4f0766c8695528b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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://bodegoncriollo.com/userfiles/file/jezojuvomorujula.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0dcf2395e---63785821988.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a994bf1079a---jalogazonobuzumurolofigub.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/02dbbb4f25559a91568fb8364ecda785/kiwuzuwekubibitudo.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d04146241e3---kinojexelatebitesus.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/vemolomuxumikovufume.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cbdebb4aac1---13796915838.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a44095430ea---91111424619.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/11447393089.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/782c1d70c69c3bc7e46fe081930295c4/44214067643.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/f7d1706b7f2eeb9c6e59297c20e789e6/32630868993.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088a42a92bef---pewugebubonekagusozino.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8b16e29da74c28a25e55a5c30675669a/8850607296.pdfIn PDF document text
    • http://dzbnf.com/upload/file///2353716934.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/4bdb72831b82127ad5ee568da0c40cb0/nilasovejizulufa.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pitamelisupewo.pdfIn PDF document text
    • http://wenxuezj.com/images/File/varelituruzipupalekibiba.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/06o2cm7bo2u2lauvc6pnv8lll1/lewupiluzakipilafunos.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/9646fd7ca4ee226b64bba7dfbf22aab9/biberomoxi.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad64dc6f87c---26584976021.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd0a0eb82---47154064594.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/merimitasigamu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/a5d8b529157fe79139e6ca12cea25fe1/5460011231.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/76154620569.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=is+a+square+considered+a+rhombusPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 16364 bytes
SHA-256: 6fff7ac2cc2e6184d6e87b7266b021fb42ecb382fc2c257f4f3abf5fdd627248
font_01_sfnt_off00013ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA9 10828 bytes
SHA-256: 42194590ff050113a0c756cb2188065931aeb370384a58e9a3a38f128244ce1b
font_02_sfnt_off00015725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15725 20080 bytes
SHA-256: 10e3fd4f18d74989efe7b7e84097e2a19220f4f1ce00009910dd7f7efc81be23
font_03_sfnt_off00018d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1