Malicious PDF — malware analysis report

Static analysis result for SHA-256 dec6cdebef2e2146…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 21:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f1eb0975341532dfb0d9e9486050e9e SHA-1: 8de17b77989eea2e10e0dcb41f0972edb59dc1d3 SHA-256: dec6cdebef2e214681bb8cfd4e6c18c41e129e4f2056f4e0af38bda2a28a551f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ewt.cz/res/file/lifimowobiwerud.pdf In PDF document text
    • http://szyqjsj.com/UploadFile/file/20210909092719240.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/siwofop.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5qcn2enr954tsvfvl3qttar8jl/11930747954.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305f3466d44---kopunawolafadutaxawudeki.pdfIn PDF document text
    • https://yasacompany.com/upload/files/baxopifusu.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/turabofiwodenikigulababo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6da78bdd4---jafokegolefaxejapimuwum.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/97673305275.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/30370424426.pdfIn PDF document text
    • https://drisraadentalcenter.com/userfiles/file/34273549908.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/94574661471.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e2b6ebc4a3681cea94676f2eb285cce7/vesenaxejewujasisetusobi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16137f5dd486db---togakajezasifavatugumijo.pdfIn PDF document text
    • http://uran-berlin.com/userfiles/file/44315024432.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/zimawadojo.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210905111352.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///49927847283.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/gogot.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/35458034672.pdfIn PDF document text
    • http://zae.me/datafiles/file/lebazezotuduwolemobinu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/16280086087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=mouse+io+gamePDF 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_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF20 17192 bytes
SHA-256: a42fcb573708768ef99eb7276d7f3d9d3a33a25a6b919ad0a35e69179dd39b6b
font_02_sfnt_off00012bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDC 10196 bytes
SHA-256: abb2fa46005b8837dfe7f8e58b79ff9b7c1e8c795be5e412080528a93757a7a4

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