Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9dd323b72df369…

MALICIOUS

PDF

87.3 KB Created: 2021-06-28 21:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49b380d0c328aa8bd8fe373b4ba39912 SHA-1: 455c8fd5b6060b40b1bcafd3fa85fa608da5c232 SHA-256: ab9dd323b72df3695bf5043fec64c29f5da95929a0eb68a7ebdb358801bccae2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious or phishing content. The presence of embedded URLs and the nature of the link farm indicate a likely spearphishing attachment attack vector.

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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/5146868469681c150852b9ceaa164461/xudemeximas.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jcpqqccgubrnej2811rra9smr8/81234559257.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/f01568f494f8eb43e3f11d5cc38b8c23/58227113259.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfd4982d69---nobanodarukenijekosa.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2ea0btllsu69epsqo04m4nmn25/55936470056.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62d82fe2c---ragotaraveme.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab0da2a5a6---bipakuzesomise.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tixofogatebolalejow.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088b1e4bd2a8---rosigivemasoz.pdf
    • http://robalton.es/Albums/images/file///zutasadenedeko.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/lazuweririrovibo.pdf
    • http://aqbnb.com/uploadfile/file/fuzukafagokagadetejo.pdf
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/ed3fbe677ff0cd2a07706fa9435f64b6/81369199700.pdf
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/2452613779.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb10a2310e---nedikodowa.pdf
    • http://mesahighclassof63.com/clients/79820/File/56292301735.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/8e9d5887b2ce778e8df90ec2473de376/tizanumuzefagoxebob.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92221787033.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/62f162aa28cf01ba3bc114b8b7e347c9/97413751905.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d242364953---92757141181.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f3e80bfb78b3089ff4c582ad16a9ef6f/92430986803.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9bleaoenonj21q7bep2kibdab/63621203433.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a66c2774---89651033685.pdf
    • https://apskarota.org/userfiles/file/42400672726.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ledazitigozukub.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7bf38c17d---fexigeroliwiwusugima.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=merchant+of+venice+explanation+in+english
    • 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_off0000f236.bin
b4a2848c39fe1c825ef3110a91db1eaab1b52e0f13fa8f26bec100236f059707
pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 10920 bytes
font_01_sfnt_off00010b7f.bin
e5a6de45e945e938067602a05ce79c9fae9825e012e0075e69a0db6fd9ffafa2
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7F 16860 bytes
font_02_sfnt_off00013738.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 16792 bytes