Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09c5de9114ddfe7…

MALICIOUS

PDF

92.1 KB Created: 2021-07-05 04:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ffa96e3136f6fc8429b8a68ee47d7996 SHA-1: e5ce6f8c71c9998fcf05e5d701b638726a912e71 SHA-256: d09c5de9114ddfe75e47fd4475c9ffbe6fc3e4015dbb37f58e1a8b77440ed8fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab30e529d2---tukodo.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b775ae49d38---bikukakewokaruweti.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0be672bc7b---dikuta.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8c3b80e96---54426995252.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/0d8cd4817aa6eb541417652a5321a4a9/34173184352.pdf
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c1caecc3bc7---kikuguratun.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/gloc8294o5t1m2jvvp3c0puueq/39030600580.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7d9ab864c79bde0edd6cfcb8918cf1f1/ratafiwosi.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32aa883392---33845272673.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/dd4cd6d8805325ea3413f2e1134c7752/87182775827.pdf
    • http://southfieldhigh1973.com/clients/2/27/27a5067865c8334ad4a5a1fd7642c928/File/vapez.pdf
    • http://christopherspubandgrille.com/userfiles/files/tegefiremulasofekud.pdf
    • http://wych123.com/upload/files/bavijoko.pdf
    • https://destockbaby.com/ckfinder/userfiles/files/sedajiwagumofimunur.pdf
    • https://gencerenerji.com/resimler/files/70554299790.pdf
    • http://polyalpan.hu/_user/file/guzamatezifamitaduket.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/49858095303.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16098bf296917b---vikijakesavuvoboka.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160748667a5d51---xemuziwa.pdf
    • http://aklond.com/UploadFilesfile///2021052418093923.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=famous+french+astronomers
    • 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_off000104d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 16792 bytes
font_01_sfnt_off00011ce9.bin
841a8cea25245d4f37b7a282f184d715194e75976353ee20b59daed2bed8aefe
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE9 18748 bytes
font_02_sfnt_off00014bbe.bin
1a729c82c20aac46a5a5a09d79d7d29ef096ac4f3b132042086b4a56e77c5cfc
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBE 10540 bytes