Malicious PDF — malware analysis report

Static analysis result for SHA-256 325aa19b5ef1a72d…

MALICIOUS

PDF

89.0 KB Created: 2021-06-28 04:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d02001a50335f1aa6022c07e89d48061 SHA-1: 3db27a350270284984620fea10e51c46430c24bc SHA-256: 325aa19b5ef1a72d4fc439f03ba5f212d877d8bf578e8225bdd7ca8fdb332371
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised websites, indicating it functions as a link farm. The presence of these links suggests the document is designed to lure users to malicious or phishing sites, likely as part of a broader phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=thrombokinase+is+associated+with
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607088aea57a1---68764568588.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/a7df02e6723658786227c84a0a9297b4/gowibatejekigiwiwu.pdf
    • http://wsm.hk/images/uploadfiles/file/rufaje.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e46351e9---93594649380.pdf
    • https://watertorens.nl/userfiles/file/10003256504.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/fqn4a68q958fetp95c64u4t2n6/gupirigexigawod.pdf
    • http://bukharaatlanta.com/sites/default/files/file/18466096779.pdf
    • http://nprofit.hk/userfiles/mozofufopi.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160924ee0cce08---zurifuloxibadix.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26a1b7dcd.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16098c68dcf748---45146039931.pdf
    • http://alibabashipping.com/userfiles/file/liruge.pdf
    • http://szao-spb.ru/images/news/file/detewomumomeru.pdf
    • http://chithanhplastics.com/uploads/userfiles/file/sodenivi.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160732a4baeabb---kulobejifele.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/421a20be92b0a050712f72f7cec2e35d/10583953334.pdf
    • http://historia-bfured.hu/userfiles/file/wikozox.pdf
    • http://tutaylamhet.com/storage/ckfinder/files/89177885726.pdf
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/kifavibori.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b23a5a7a2---gipigadijatomexa.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/krt14tan4bo7nns4ah05bd4lhg/tomokipugepit.pdf
    • https://audreyheselmans.com/_files/file/ludadez.pdf
    • https://agrilaui.com/userfiles/file/rokunopukezu.pdf
    • http://mayinluatudong.com/uploads/userfiles/file/10470282583.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e954e689a6---rakumidasilokupajuwusip.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aeeec083b---19244507407.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 16792 bytes
font_01_sfnt_off00011451.bin
4ca8e9c809658a3c850a19f848537c86ac5cf3f12ba0914a4796dc97c5451704
pdf-font-stream PDF embedded font (sfnt) at offset 0x11451 10872 bytes
font_02_sfnt_off00012d4e.bin
3b4080a9bcfa46a40ebc41000e0664235c69aa240769cfab9c766ace2e68e573
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 16260 bytes