Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b18be29ef2d964e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 02:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9100197fa9748056d0f91ac3b0d9d565 SHA-1: fa692e3a49c8d9515f77a79dfc0c219ccb7c3723 SHA-256: 4b18be29ef2d964eda5e1b4408024ae51a6ac6adb6ab689cb17a9b8179645a5c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous distinct hosts, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://petukmahaaaraj.com/userfiles/file/44365455730.pdf In PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612761ca77e1d---lokojizofozusekaf.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/75161fca2df66bdfc076901b0963bf6d/xonovifetovaw.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9be7bc4dc---23416726875.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/gefesodogi.pdfIn PDF document text
    • http://macap.nl/app/webroot/files/userfiles/files/sutugifunowisaxovinume.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/sejinawejofuro.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/talifewetovuraxivukis.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/79707094668.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///73191468644.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/50242236347.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/tq3t65mm4b3iu867j4lrtu7hn1/45295282180.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/alrrplgca0q8t1rth4t9lks695/wutatulitekeri.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mvn80h28uosb0l951i9u49e5g3/nezatagemenetaxukot.pdfIn PDF document text
    • http://chieucoingason.vn/files/migibimujegipanox.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/44748574839.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090307b951b3---27118109645.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/342svsmtr8c933415vi0149742/30522140685.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/pupapadebomisidinuduvusa.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/dhmtmup6demhd5s0jg55tipqno/vodukivoxidojewu.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/e8880afc06574f4f2d83739b03b3e935/xemewuf.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/78941071157.pdfIn PDF document text
    • http://veejaytechnologies.com/userfiles/file/lozotixogufedefu.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/56377863643.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/64602252611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=aprender+a+leer+preescolar+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_off0000c3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FB 17136 bytes
SHA-256: 1422c8e128587ab672b2963485d1b0aa8fe4b477ac5915b2d4e22ea603672d5b
font_01_sfnt_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10404 bytes
SHA-256: 2ace8997f4b09134e8c98c6e0820a10c244233d675b11fd9379ae634336112f2
font_02_sfnt_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1