Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9dfed989746d43…

MALICIOUS

PDF

78.7 KB Created: 2021-09-20 09:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: ff9b004901fac0f04b529748c2d585ee SHA-1: 1817c030582e67eb0bd3de906f1460902cc16937 SHA-256: 6c9dfed989746d433be0f842f84bb9e7c94d50c8fe42be999b21bab4d8f7f0f4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded URLs that point to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4037

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ketchas.ru/uplcv?utm_term=oreo+frp+bypass+apk+pangu PDF link annotation
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/83459565093.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/11033452270.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/gomodifonigimexepedaremat.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/funekupofezux.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/41157950656.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/31644135658.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xibodan.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vitaxu.pdfIn PDF document text
    • http://vibratingsieve.com/d/files/vazevagajozokasogeb.pdfIn PDF document text
    • https://fanaf.org/article_ressources/file/19978953682.pdfIn PDF document text
    • http://pwharrison.com/userfiles/file/94919154766.pdfIn PDF document text
    • https://specializzati.tecnaevolution.it/dataload/ckupload/bubepujizadiri.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/raputumakenixugimi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e021b768d3---natimeziduz.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454e79b280f---gukubenudaf.pdfIn PDF document text
    • https://defi128.com/userfiles/files/xitejotuvusotil.pdfIn PDF document text
    • http://vititanon.com/user_img/files/65995301144.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/bilevanuna.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cf77360fb1d2e70dee1da34b603b2c7b/37464623297.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/kuroxubolum.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/nafiti.pdfIn 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_off0000d0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E0 10768 bytes
SHA-256: 1a500d81a91cd6cdf253441c5574c6c8695bb338c7cecfa4cf1e41ae31289c5e
font_02_sfnt_off000101a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A6 20816 bytes
SHA-256: 0ee7585a13422616e0285f4a1ab79c7a64066465898826ff0ec9be0f53209b68

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