Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81f9e4a9cce9408…

MALICIOUS

PDF

86.7 KB Created: 2021-09-13 17:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5abc6b9669cddb669ff1dc5c81232def SHA-1: 5c5a6fa494b0cbff2b6148ec530adc5774457ae9 SHA-256: b81f9e4a9cce940852fdd29887a8bf53c9ba94231f09a5650cbf2c09959855d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=super+city+superhero+sim+mod+apk PDF link annotation
    • http://csc0512.com/userfiles/file/20210911223653_73vylu.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/korunojitowitim.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e5b34a44---9262303171.pdfIn PDF document text
    • https://mahae.hu/files/files/mipijaloxud.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/58419049496.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/15014633629.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/bobozidibonologe.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/gikilifaju.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/3o62iioou9k0r960n6en6se00f/81126579482.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niwokipuganenaruv.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/23772466596.pdfIn PDF document text
    • http://morard-mcf.fr/data/Files/87033075518.pdfIn PDF document text
    • http://unseretochter.com/images/file/rolajusomogibegonud.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/pupiwevadizinejaxobij.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389b96d3243---gokimenira.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/69476780436.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109111901263864.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/tizumafosuwolerafofi.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/39965669834.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/55155795317.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/guwarebokopudulid.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e6a3a949---33347829163.pdfIn PDF document text
    • http://maimungkorn.com/UserFiles/file/vimadezipimizenejugotaz.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/46357986935.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_off0000ec3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3D 11012 bytes
SHA-256: 786742718f95204b83f013328b71541441469482b8948e1de7828db9229b3ec2
font_01_sfnt_off000105e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E3 17980 bytes
SHA-256: e6ca4f2860506a15a237a3b624b2eba23c4e44ebcf93fb54a34d58a5123a19a8
font_02_sfnt_off000134ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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