Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d377aa7b5333df2…

MALICIOUS

PDF

78.3 KB Created: 2021-06-26 04:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eeaf5cdd28eb576195eb00e5ac316be4 SHA-1: f35af1a1d204b3b2eae6538bdd532585b6d3e72b SHA-256: 6d377aa7b5333df2e400b0ea84698eff7b66c2392d4511ece0cd3780e1a534f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to potentially malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a deliberate effort to distribute traffic and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=autocad+electrical+wiring+diagram PDF link annotation
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8fba20e3c---gojare.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7e0fccd88---kafotitodemanesadapeb.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced7cc5ecc---jufisojakimibigatenumitad.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a189d0978---xuxaxev.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/dumedobiveve.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/080992848321cfa986d86f4f6b6b8464/bisegolewet.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/30156051451.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/ec105a9ca7eb37443a0eb62674eaf0b6/taridiwusawezutajawuboz.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/584d2d71b73512aa1c99c25d54dc797f/lajixonijuvaf.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/12028328644.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/938e211e0e94c041b1b389f14b3c3966/93649948497.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/e48094a3d65d0a9781bce546475b5056/bipavalinevonenufigekiwil.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f17e5ea28c---fuxaguwivunasipevubeg.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/26or2t9gp1v86j48jqq0c2due4/nirekomununofudexeferip.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c873cbeee55---mivetisulalivojaxopun.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160c9752df2478---dukoxotekelojudo.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/10136522298.pdfIn PDF document text
    • http://mutitar.com/user_img/files/61874035437.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/aff9d9850ad0ee042bcf49c7d2fa48a1/93351171919.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/90629429986.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3cddd52b90c2b4ce48b5937ee2bd4214/ditozija.pdfIn PDF document text
    • 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_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 16532 bytes
SHA-256: 918ba936f44e94b2e29c0d7ebbef30692bd5d2a8fedfc0c97eec00560009ee30
font_02_sfnt_off0001139d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1139D 10712 bytes
SHA-256: 523d1e56e4458d5afca76f8d547e3326a8adbd3db5b55f2e724691302288114e

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