Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6fb26034f1780a7…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 02:22:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 4ef9dd5eb654a9ed2fd79e91bd162ad8 SHA-1: 9dba81eb9da7375083930a5ca13326f36e0a82ad SHA-256: d6fb26034f1780a7a1097a32d53384cffe1b7e9ed3ca8083b40a8c5dbd314c58
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or are part of link farms. Heuristics indicate that these links are used to direct users to potentially malicious content, classifying it as a phishing or link-farming attack. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://digivideos.net/ckfinder/userfiles/files/bonutakuxozaxel.pdf In PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/bomujidamerivug.pdfIn PDF document text
    • http://klhl.com/userfiles/file/manorirufew.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c224d20bd0f---venibekixofinijugabixepi.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/wilifisedumanoke.pdfIn PDF document text
    • https://tavio.ru/files/file/79008544257.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/xiwasabokepevopadaza.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/megupivipikirobakades.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/nogisijivusawijagu.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/89105685709.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/fomaliboboxatukoxujo.pdfIn PDF document text
    • http://gabortech.comadmin/file/gexedim.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/54065327694.pdfIn PDF document text
    • https://citytrafik.nu/images/file/pijilotepebudalizowi.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/994907410.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de6bb8ae2fa---wasimotugebogajetixiwu.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/jizoreguxebuxunuj.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a8df423f1---zurekijaretarirupiguxu.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/beduzubibafepakaj.pdfIn PDF document text
    • https://matratva.in/userfiles/file/wanivigut.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/71148625016.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b26136fbf27e2bf2f5ab9a2059168cba/zelotuzuvu.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles//files/13476655629.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7fb061b3---36290619245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=aghora+book+pdfPDF 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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10348 bytes
SHA-256: e2345322ede06e03ae288ef6c4d413b14412eec391f49ccea5ab474a5b6bc494
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 18736 bytes
SHA-256: c912819337955b240ab4cc717e1d6d0ec7e153a9dc41d20912276db6fd8ab90e
font_02_sfnt_off00011f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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