Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6ef209aae3cffe…

MALICIOUS

PDF

84.6 KB Created: 2021-09-01 22:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c31f29d8af4534f3e99bacdacf76d31 SHA-1: 35d0e8c511c3c7298062f26806a6c92d3a7af903 SHA-256: 3d6ef209aae3cffe2897056f420b76ca3e32fc6348c78a53ce44936bcc15b8f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to lure users to external sites. ClamAV and ML classifiers confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://tgvl.in/uploads/fck/files/53927675544.pdf In PDF document text
    • http://www.aadhar-interior.com/userfiles/file/73384038972.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/vovape.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/952b9c6867a707aaa13827987c4fff52/15182552580.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe2794bfda9---88156917355.pdfIn PDF document text
    • https://migger.dk/userimages/file/79172541804.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd1382d45---61545182886.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3600fac549---zimegafibobuwopa.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/nilap.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef80e6f310---lokamidu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/liwukijisataveda.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/puzigodukoropolimazora.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021081519200986545.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/vavujidutotizalepe.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-14/20210514105101411620.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/fotuzixupek.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/nugosiguwivepeluguko.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/gugejowimipedawomukorugiz.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/jipupowe.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d42d799f0---85983581323.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//17315075117.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/merurisuxusitiwiredileja.pdfIn PDF document text
    • http://slpclassof67.com/clients/45391/File/46781184338.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/89391145350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=if+you+block+someone+on+instagram+does+it+delete+direct+messagesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC71 11216 bytes
SHA-256: 7492919fc7daed6be8617a776f71eafde3d2531c8b95b56d08680890ce50fd3c
font_02_sfnt_off00011682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11682 17452 bytes
SHA-256: efea1b140fbed766c8586f209baa448c4773b569b763c42a764b90b6b8e730fc

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