Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4d6fb45db0ce56…

MALICIOUS

PDF

93.4 KB Created: 2021-09-18 10:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 98198590c953eab252ae9a122811d200 SHA-1: 1ebdce612f5e901ff888f7a0702a2efed82eaa0c SHA-256: 1f4d6fb45db0ce567b4ae111a7ea3d30484c277b57cd3122308b46fe27e736d8
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a second-stage payload disguised as software. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/34811028687.pdf
    • http://iiiemjobs.com/FCK_Editor_Images/files/rokosowef.pdf
    • http://stavo-bazar.cz/userfiles/file/22745792651.pdf
    • http://tradotel-riviera.com/file/14505701044.pdf
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/direzudowoziki.pdf
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/54765690219.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312b762dc81---nebawisofakevi.pdf
    • http://2ds-creations.fr/userfiles/file/tubow.pdf
    • http://jakspravnenapsa.cz/userfiles/file/30181605748.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161419a7367114---30878829532.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/xelabifebijuku.pdf
    • https://rougezenekar.hu/files/file/72178708393.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/42353539925.pdf
    • https://mimpishiosatu.com/contents/files/majufovo.pdf
    • http://rideco.hu/upload/file/82887929544.pdf
    • http://dbexpertise.fr/catalogue_dynamique/file/zusupadomipobimed.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7dfde185---gakukiwojinipotuvuku.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300415f0dbf---xuxaveberitamumadeg.pdf
    • http://faurerom.com/userfiles/file/josam.pdf
    • http://navigator-nsk.ru/userfiles/file/rovamotomoluwogel.pdf
    • http://seychelles-resort.com/images/blog/file/widevinutober.pdf
    • http://mvdeastudio.it/userfiles/files/2903850276.pdf
    • https://blugarden.eu/file/53636364930.pdf
    • http://kleinschadenexperte.com/userfiles/file/zuxumirok.pdf
    • https://goldenlinejsc.com/userfiles/file/saperupaxuji.pdf
    • http://wenxuezj.com/images/File/mujigumebelotitunivizoxad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=autocad+2017+full+crack+serial+keygen+free+download
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 16792 bytes
font_01_sfnt_off0001152c.bin
5ef39154ac5e36bfb6f8ef7e7f7f16e9d946f45d971aa410244cc7a7ecb74f1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 11368 bytes
font_02_sfnt_off00013027.bin
5d278677dad7c03b752a105aae5daf2fc2a023ad0cd2c956a178041b0cbc8b88
pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 21656 bytes