Malicious PDF — malware analysis report

Static analysis result for SHA-256 6079f6b798fdab90…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 11:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: da32991da6ab35dbe435a02973a83b81 SHA-1: cb250977e61552c27c6ed028500072d4f2a7fa9f SHA-256: 6079f6b798fdab906a552070845a9fdd5e8fe00d27bb5e031ec2d4ae7ebf300d
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier, exhibiting characteristics of a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tranduongauto.com/app/webroot/files/images/pages/files/31756018131.pdf In PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/39560271211.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/7912263498.pdfIn PDF document text
    • https://harmony.im/userfiles/file/74982274932.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/watomolugirirojes.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/jubomidofebunedetili.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/27290983252.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/sawisivatu.pdfIn PDF document text
    • https://neksav.com/upload/ckfinder/files/90076060013.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/72808838039.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/53888877722.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/kojoga.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109020331178557.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/nupokexugamalam.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/563241489.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/dubiboveruxir.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109161052455210.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109070211047341.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/kamoraxutadubegutixebonel.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134534e439b1---rivufej.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613c068e58688---1191250741.pdfIn PDF document text
    • http://pbhdom.eu/userfiles/file/10011149253.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210909064757839.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f76e326c---gozifasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=javascript+primer+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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 16860 bytes
SHA-256: 7a879f12314a5dacc16b6b14e245c8002ee0daa3aa52221aaf2643223c36bca0
font_02_sfnt_off0000fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA77 10568 bytes
SHA-256: f89437fce734b782b21512622f32f43aca05d0e7035b5d2d336385efad590518