Malicious PDF — malware analysis report

Static analysis result for SHA-256 6894b7ad95119e6c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-10 03:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b747d7e62e8e7b7ff4e424b5374a6d8d SHA-1: bb24c11ccf88dd6caf6186e7bf26745b8501f78a SHA-256: 6894b7ad95119e6ca6ab90f12887a2875fab69bf9ebe2327646631f98c472747
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://rubfila.in/files/file/norifi.pdf In PDF document text
    • http://fratellibeninca.com/images/file/gatakuzijebifubopag.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/begorimoniparukuwumir.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/55080402662.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/mivomefiwovubonosifap.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133376bda6dd---jojexexajexagupazijabe.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210907174324_OTU3OTU0MDA5OA==.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/72066598784.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/zewexanijo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76df2a9d7326c7ca5119b23de52fe495/poxaxoraximasoduli.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe825c038c---nojudimipamulafus.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397986d16b8---27827490976.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/nadatovud.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/66d1df9a9c73835205c44afd9edaca6f/73592239958.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/kosepewuvoxulunufewes.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/sesesavilodo.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/pikadabomigagedakipefapol.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/mirinobegolovax.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/613a3e15e1798.pdfIn PDF document text
    • http://handgun.ee/media/file/24232069616.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/15730959627.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d95964672cc07c5cdadc95b58dfb7a8e/4250271061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hotstar+mod+android+1PDF 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_off0000ed6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 17784 bytes
SHA-256: 8e2a6626c6a1b756d653b92b409bbf930c013ed47d8307e6b9c6834660055e95
font_01_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 10272 bytes
SHA-256: 4981093fffde5bd920ee8ad9d20697394e0577e8f3601e60a98cc88b6d3d1ae7
font_02_sfnt_off000132b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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