Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9f6b1e28b88005…

MALICIOUS

PDF

90.5 KB Created: 2021-08-16 20:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: beffd4a41cba2edf401b119a8abcfc00 SHA-1: 093dbf8321624af5ed1ab6b316ef0610c27011ed SHA-256: 7f9f6b1e28b8800568d1fbc35d079746d671a4173245f15997c9c1832fb5feb9
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or appear to be disposable. The embedded URLs suggest a phishing attempt, likely related to timeshare cancellations, designed to redirect users to malicious content.

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 http://mp-journal.com/media/file/rakumametubukase.pdf In PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87607ec1a1---bifojutomigavetudu.pdfIn PDF document text
    • http://unsersohn.com/images/file/19564992853.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/munamevarureziloxowo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/30b85d6ebdda4ddac5d32c97e7f890a9/41041489723.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c542aee4dd1---tubebuzatudafofisevaxu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/9ovcaoou31isp98l8rqt493dnj/kurigadevepigodixiwase.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607debb50d6de---sowimiguruziboputajex.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/bff3a703b2e276202cd186afe745e31a/pazenomofowalutor.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/99e3e3ea6a75d34fa222ccf25adcffdd/vidonivabup.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/ad1f7f22e88572b1d1db225a864d0f5d/makumuwosojowuluga.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/46086192996.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/dapivagitosavefa.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/didagagukijobilebixuv.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3af92683719f564aca0d1e0b677100ad/96647158724.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/93553755662.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d7dcbdfe6---29950816680.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/7uk1eucp5n9fad6rs8dg0tp4r5/zonukebikowisevo.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/656278891.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/l4ss8kviq7iie9pdqmmrvtepg4/71301966544.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad4a5bf12---90848884095.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7916684b05---26629734283.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/sumujaz.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/92003921589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+write+a+timeshare+cancellation+letterPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE699 16972 bytes
SHA-256: 9ecfe7072d1d78974e16cb8cf56ff36da8e59192eebf59c61485cf4a61ce1d54
font_01_sfnt_off0000ff40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF40 16872 bytes
SHA-256: 3b08380ec2ee79182db1fef36c5ff37f76c61aa426616e0effc9ed6645247b4d
font_02_sfnt_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001434a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434A 10572 bytes
SHA-256: 09e1d9a1cbec80c86300b7313a65adac8813dd53557144903723b40555f64ea0

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