Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de52ee3390776d8…

MALICIOUS

PDF

96.4 KB Created: 2021-09-17 02:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3048cc5a87f3d85d14a946d93e31eb73 SHA-1: 151e4ea13afe45db2650ac9d4fb18694fde59dfe SHA-256: 6de52ee3390776d80357ec1f6eb374d66980a19ddfad8e95feeff952f8ee6c7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious, suggesting it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=bruce+eckel+thinking+in+java+pdf PDF link annotation
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/jajowo.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/zater.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326f21ce0da---72715689246.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614003aaea7a6---91515238077.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dapilegefosa.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/desamovazovilonuf.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/93513296568.pdfIn PDF document text
    • http://compsult.net/userfiles/file/xuvakiwomudari.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/sejodubekudekafisepudef.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/suzogulelirefiliraxud.pdfIn PDF document text
    • https://highrise.pl/file/womotif.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2940d3955---63710031564.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/vofoxitaxalijepoxoronako.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420902d558f---gozesuxinubarejivaxewi.pdfIn PDF document text
    • https://rsvforum.com/userfiles/file/54464262432.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pokefowetuxekizopi.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/25686787744.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/guzukosuperisorip.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/62921414648.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/volulanodowuw.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/27390673498.pdfIn PDF document text
    • http://metapolar.hu/tmp/33664035662.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/71654549049.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/warumovawoduvetotig.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_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 19084 bytes
SHA-256: 70573164e0c32b41b82b9ead34da75e784274252faf3581bb568f1514bce5c61
font_01_sfnt_off000141f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F2 11052 bytes
SHA-256: 03ad41fc86a8f1575319f52b89bc2fda83aeb3bc656b254f7ef7df032e1e8e98
font_02_sfnt_off00015b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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