Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0d58d34b8a6baf4…

MALICIOUS

PDF

110.5 KB Created: 2021-06-27 08:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 46af14d7606ac8b0ec76340ea172efaf SHA-1: 3190b31adb52e73e872b3e8a403bf878893c2353 SHA-256: d0d58d34b8a6baf445ad64765c595783cfb3d8176f90984631edf2e6815caf86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious content within this PDF. The presence of numerous links pointing to compromised WordPress upload directories and disposable hosting suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa9bd60d880948fbfa090ad0f73ab1f7/bubedutezaxopegufevawa.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rniflumc0d7j5v66jqcugucqu7/70423711185.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/31cbc2fa638ae776f51120dcd42a9854/70791800476.pdf
    • http://nesemlak.com/test/images/uploads/files/savakexixun.pdf
    • http://szkolka-wiercioch.pl/files/file/wilonulixita.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503183324768064.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fdb42132a---nasibuwuvowuwavabenarero.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/24976645097.pdf
    • http://stlukesmn.org/clients/17773/File/19529566135.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/53285d17crnaci43bf49jom187/lifezinew.pdf
    • https://fallsplat.se/file/kiten.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/35ec101d356c6bff5ba34b894155678c/wosokexovupofiwora.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160943a6aac0a2---31270937844.pdf
    • https://deniz-sogutma.org/img/userfiles/file/taletanezamu.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ct4iir5lf2ahmllss3p67d4u11/zarekovisezifu.pdf
    • https://kanalprofi.at/UserFiles/file/94694001991.pdf
    • http://yule-sign.com/upload/editor/file/20210606124903.pdf
    • https://vannordenvastgoed.nl/userfiles/file/xumotekefizizekuju.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/sfied8pmp9amuqpd0ea9ptm9c1/mazoderifu.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/54dc42a25447ee7bd415f66ce51970ee/68192685734.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd29b0c0a29---puvefikojunaxutewarol.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc6e6f327---82786381212.pdf
    • http://biosurfest.com/userfiles/files/guxot.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f8570b57---futetepoferif.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160be86597cfbe---godorolexojezolonibu.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089775f4ef21---zogexirugabafaselo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=types+of+saturated+fat
    • 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_off00014f6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14F6D 16792 bytes
font_01_sfnt_off00016784.bin
ab52a212acd07c28bbef2d33438f6136d1777571d8509a119c4d4df14bf5994a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16784 10428 bytes
font_02_sfnt_off00017f55.bin
e4497bb20a5936d14e9fde6cf6e48f5d908210162a1fa7e4ed928b1eca6c3137
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F55 17712 bytes