Malicious PDF — malware analysis report

Static analysis result for SHA-256 128cfd3632f9263f…

MALICIOUS

PDF

97.1 KB Created: 2021-06-30 06:22:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aee73c82a1f6dd28f30f18075136b42f SHA-1: f2f5c0e2183c9d05b05548fe3476416d33221352 SHA-256: 128cfd3632f9263ff8167298f53ad336fe6c340d781bd7463a541885191be474
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded URLs indicate an attempt to exploit users by directing them to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://synerhu.ru/uplcv?utm_term=my+testicles+feel+like+a+bag+of+worms PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe59a3c5b3---narupan.pdfIn PDF document text
    • https://banghenails.com/upload/file/xusogupupi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c5dfc251f19f91c7c73b9146ef43aa30/75904280828.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/85036095242.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/fafikeguv.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/ponik.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/930e3712ee1c97fd036be9b48fccaf54/65334551780.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/77546719722.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b451409aec1---wowawuzavemafotinojivig.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/5117882518.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608446cdae83c---88127656409.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/sunas.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/kovusonaseval.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9ecd956b5---demosibufuxaxetox.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/dadebozit.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/86275884097.pdfIn PDF document text
    • https://szaktel.hu/uploads/file/73734475283.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/dazasivelojufo.pdfIn PDF document text
    • http://indagosrl.it/userfiles/files/22048513780.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16075542e6a47a---zosojekajobiferaje.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/jefujukukaxalazatoxema.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/13234952089.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbc0a70533---tizowoduk.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/93563107403.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_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 11000 bytes
SHA-256: cef26c7312f2ebc1bdf4a43676a6a1f4f713cb04bd71b7cf52570d0a2ee87907
font_01_sfnt_off00013304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13304 16848 bytes
SHA-256: e3b417f7f852f733b70e4a139613a8d78ce1b457fa09432458493dd785610dbb
font_02_sfnt_off00015ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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