Malicious PDF — malware analysis report

Static analysis result for SHA-256 133361325b0d09a6…

MALICIOUS

PDF

79.4 KB Created: 2021-08-18 19:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e5c6d268703776fe794ea317e3c0bfb SHA-1: 9731676462cd01def991a4a74b0b28ae29a9ec10 SHA-256: 133361325b0d09a6373b044487bc0332041635e5dfcd528c9c5bf7f514d64cf3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised or disposable hosting sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it is designed to exploit users via embedded links, aligning with T1566.001. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://hogan1973.com/clients/d/d4/d4eda5e2427b34f3a15374adde9a77da/File/fademixizusikijilela.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/70613146925.pdf
    • http://xprchemical.com/upload/files/zebamitibumofiraku.pdf
    • http://zetrade.cz/userfiles/file/lorexuranax.pdf
    • http://canxetaianhduc.com/images/file/84679009654.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6386a7ca---76360277010.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee939c9271f---40733497434.pdf
    • https://chasehr.in/userfiles/file/18493335743.pdf
    • http://romanakladatelstvi.cz/userfiles/file/82283484962.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c44f15eaf---8231227229.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/juropej.pdf
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/64659159910.pdf
    • http://emannsltd.com/userfiles/rodusiratawuno.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ki3p9a7fvu13ef3joejo6tud96/gelunavatu.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16105ca24ad561---50604609334.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d6278c8fb---18820429194.pdf
    • http://eortak.com/img/fck_temp/file/pitajagejalonagikozerom.pdf
    • https://marljivo.hr/userfiles/file/mewuvade.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095bdb78893c---sivipelabifupen.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610d8d749187d---xaxaxuwujol.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115a9b0bc178---57525956978.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c977d5dcc1---duvibigumas.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0iaf85qm3ucds162m2bq9p7eo7/53947317699.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/3k4d8ootib3bhreau5ns1ov87p/pekajokefanamiwifolaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=alcatel+one+touch+upgrade+s+2.8+0+download
    • 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_off0000ceef.bin
2c4408075ce3f64b3817135470c86b22385ca8a8e4f54f8e0bb342eb5ddce5b3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEF 11384 bytes
font_01_sfnt_off0000e9b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B9 16792 bytes
font_02_sfnt_off000101cb.bin
7ed8c35934b716cb35ab77ed0f0fd44e6cae4f60ab6ebc8e35ccffcd0c7b9e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x101CB 17380 bytes