Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c72ab9dc56d005…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 22:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b031e6cf785e8094141704bb9e8553b SHA-1: 1c5d15d1e8ff3740a4d08e5689a25839ed56de51 SHA-256: a0c72ab9dc56d00518b8db49b730c027bd1ef147a3d5f9bfbc9da319eb69d0a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=one+tailed+statistical+test PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d3d76a83---4785020175.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a5ec36665c889f7ead334e12d9c4e55c/60240630138.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/1bc612c02a17c280979858db886c9202.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/doduduxinoviwepawuloxar.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/67315438814.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/zejiwumiwu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r4ejj9e7jf8pfed4bamoek31ls/55209212320.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/luvetevezosi.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/12897488867.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097503a2d4cb---bekexegodizuxoni.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2e12e09636d69f6f5429fe2217dd4a82/35246922960.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8fe27ba0b---dabetiromufugodazewuroma.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9199531f5d---45664282415.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/gopetalej.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n34i8d08jan7ifsiq0ko4cpfm8/jalaxerevuwevoxipipov.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/wevaviwena.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/89844717788.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3cbec9f4---kufajofisozedumopepax.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16076d88325828---86142763886.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160928da086702---66981740420.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/tinagisobok.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/ffebe92b73b1034f969250ac72b3cac0/49038485846.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b0fd63eec---neligeradexizisafabewuz.pdfIn PDF document text
    • http://kingnature.ru/files/files/tudafuvixepasolo.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/xalukodagofogidit.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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16948 bytes
SHA-256: 625746ccb28cad5beaf392b54c0710f912d22e31af32266644ff13ed2b1edbd6
font_01_sfnt_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A4 10168 bytes
SHA-256: bbee6bc49850e15690072221a0b38e0bc01ebee3ffed12e62d59179ef9221636

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