Malicious PDF — malware analysis report

Static analysis result for SHA-256 d834427d4814809c…

MALICIOUS

PDF

83.6 KB Created: 2021-08-26 13:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1dc73fb4cc168d983d2e03393350958 SHA-1: fd0f3483e694eee94ef660c2230232e597fbc239 SHA-256: d834427d4814809cf4b09a6bfa8f58c400fc3c213c8be9eb960da0f5dd67655d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=impossible+quiz+answer+59 PDF link annotation
    • http://goldmustang.com/files/files/rubofogituvowevuj.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210815155049.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gqo9th72424086ags85ksah3q1/burutupuji.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/31378467878.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68663ad47b---dizowoninuti.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/vipologavimagojofakoso.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/dilurirabuzoreruxop.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ac5ae91d6---89001874610.pdfIn PDF document text
    • http://premium-h.info/files/files/35421651096.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f61a8aa07---47209595591.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/4011226478.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/fimine.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce314614bf0---80571887436.pdfIn PDF document text
    • http://pvvc.cz/files/14933487830.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/sitasozurigalos.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/a21fa4fa5d9c939508b29263e1f5e949/zugetipuzasiwotomowib.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/933a5681f0bea2165f7fdb2c6f075c79/43806084469.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/73016808853.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/23317341221.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/wobaganizexugasebezuleji.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/15018053449.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6d882bbbd125e8d7188b1999584cfa1f/tetel.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668fcdd49a---fopatezowogori.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_off0000dfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 11100 bytes
SHA-256: ebc1eada2fd888043009b200bc1b8b4716e3357902bf41b5d2fb3c89d3f8fe46
font_02_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 17220 bytes
SHA-256: 5c5c656f004e0cf8ad0653c528a51e822da8699ea32a9c0b75e0661473423fff

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