Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4baa0aab00d00c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-22 20:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f70867fb39666846eca88920944bf76 SHA-1: 15e272d1fcbbf169ce7194600d13dcf4b6601341 SHA-256: 9e4baa0aab00d00c3755ef5e84f01c9a6eb122b4397d5979a4f1e9700fee417f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDF files hosted on various domains, many of which are flagged as compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the structure suggests a link farm designed to redirect users to malicious content, likely for phishing or malware delivery.

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://happycondo.leaddeehub.com/userfiles/files/defeguzegomezifun.pdf
    • https://aokman-drive.com/d/files/xijijilekavojonexigatutib.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/59054395729.pdf
    • http://1day2night.com/UserFiles/file/59589431795.pdf
    • https://wolfgang-photography.com/userfiles/files/timakatiwabitelevenil.pdf
    • https://confetti-seasons.ru/upload/files/zixijakitoxoxemujikepisi.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eb13dbfbf---mojerelunodamekawikidu.pdf
    • http://yilip.net/userData/board/file/razevizuxom.pdf
    • https://webaprint.be/img/file/37729909365.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/mofiniled.pdf
    • http://impex-italia.it/userfiles/files/gozefejuluxigituxekaf.pdf
    • http://iehyun.com/editorupload/file/86019944494.pdf
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/55057020840.pdf
    • http://np-laser.com/upload_fck/file/2021-9-21/20210921024349995096.pdf
    • http://agisinfo.ru/uploads/content/files/47057769736.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210916122038.pdf
    • http://nfrostov.ru/upload/files/82840915295.pdf
    • http://palakkadtourism.in/ckfinder/userfiles/files/61259232515.pdf
    • https://rugsinc.in/UserFiles/files/lojupix.pdf
    • http://maychamsocda.vn/images/userfiles/file/89825185738.pdf
    • http://gramercygrand.ru/files/file/walirirokatovurewiborigu.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/472526ff97be769ab0219282e152feb5/26905242819.pdf
    • http://idroter.org/userfiles/files/33194484507.pdf
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/xejusabixunudilepis.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130850a7c718---1178127304.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ichess+pro+apk
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f9.bin
78b24a345545768bc96a05c54c809f6e6ee17734b3765c9f4bd94d94b58820d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 10176 bytes
font_01_sfnt_off0000f7eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 16792 bytes
font_02_sfnt_off00010ffd.bin
89c1c24287cbf2866bd7124739b8ca98d7ea476aacb136257177ca4f701282cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 19420 bytes