Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c62e5bad04cd48…

MALICIOUS

PDF

90.9 KB Created: 2021-07-09 05:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3344d4bb4f2fe872c673ba2219860bfb SHA-1: 5711e5a33531a4c5879708b389226912d47d1a41 SHA-256: e6c62e5bad04cd48b4227474439d767e4510dcbff01e58e1546ae2aa0ba5ae77
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of numerous links to potentially malicious files on compromised sites is sufficient evidence for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16086e56723f5c---66063711868.pdf
    • http://hysansam.com/fckeditor/userfiles/image/patuzevazajuju.pdf
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/mudutaxokeres.pdf
    • https://akemi.ro/hirek/file/tekaf.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8a384541cb926ddc334d00c82cffa66d/dosazibu.pdf
    • http://fra2ange.it/userfiles/files/65624121998.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wizadesuwuvogajata.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/keranagofosazisitovugoz.pdf
    • https://noventa.cz/media/files/file/vazawux.pdf
    • http://sattamatkapatti.com/userfiles/file/wadexuwazod.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/30aefb4dc383aea43dd32bfba3424333/19678534205.pdf
    • http://longvu.vn/Images_upload/files/12112177852.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907806d5eb7---buzefiba.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609685a5752fa---12693079031.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609297b3a0d9e---83972456669.pdf
    • http://cgl.lu/userfiles/files/51898742208.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072829b9320d---60613425564.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/dupelemipafig.pdf
    • https://vsetinrally.cz/userfiles/file/18377493720.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/l5oqs2oefv4s5mi876gkhj5jb4/ralemipepunitepibizamujip.pdf
    • http://mastersequipments.com/ckfinder/userfiles/files/55766754090.pdf
    • https://mps-india.com/userfiles/files/gebidaxarozufewoku.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077ac4565252---menetuxufe.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089bc931ba6e---jipapefufabuzalinizegen.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/66079376c9766d583cc4fc1207cd0c99/72850460707.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+copy+pages+from+a+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e869.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 16792 bytes
font_01_sfnt_off00010080.bin
62e6cf10df02d7a1493f133186f2430e56e5ffbdd8f9874446b6114299574414
pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 10904 bytes
font_02_sfnt_off00011999.bin
a22cd470bc0772196adb11f7b868ae78c404e67bf401a4c71f6e347a9a97278a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11999 17592 bytes
font_03_sfnt_off00014724.bin
dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
pdf-font-stream PDF embedded font (sfnt) at offset 0x14724 16084 bytes