Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d13d758af06257f…

MALICIOUS

PDF

92.3 KB Created: 2021-07-02 19:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4deb0c200b9e0a3cdfb4a90a7228bd6a SHA-1: ab5888045ea4dbe945928b678cce47a83516c88d SHA-256: 4d13d758af06257fb6da487eed66b63f98c1ea000816cd9d84c5d53a78452fd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073100472edf---50265624346.pdf In PDF document text
    • http://derma-dts.de/files/file/pemim.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/79dhj6dd16ehscus7j6pceidb7/magawas.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bef91e4edaa---demibisodeputekivemozewod.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/926a47c68b0be7208a3e55ebb06d1272/zewukubodatufusas.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/69334733018.pdfIn PDF document text
    • http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/17660084932.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e78cadab206da1113a076418e842a4e9/sijoviraborev.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/47bfaf92da36a7afc7d39e45affe781a/15728691934.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee8bd8c9d1---74545851099.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e531623458---18109229096.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/608a3ad806f9b37b21ed0915ff09a7a3/22188110109.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/25139808271.pdfIn PDF document text
    • https://lesura.net/userfiles/file/givevuvetekamigewaliza.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/43c301362e1bf4bb28975f4aae9289f5/gegalopebososes.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ar8n3etu79pftu06trlpkirmjh/sopotiwavemakijod.pdfIn PDF document text
    • https://vieclamhanoi247.com/upload/files/saxuxazoruwosizakafabej.pdfIn PDF document text
    • http://azizolace.cz/images/file/papagalutadibipi.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607914d4c3620---dopepufizaz.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16095732372ef4---80691335002.pdfIn PDF document text
    • https://saam.vn/images/content/file/12334643797.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/i98fsbpnf2gtg7kqudgj6130q8/97400156768.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/50046161322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=psychological+causes+of+dystoniaPDF 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_off00010689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10689 10872 bytes
SHA-256: d702df7920039522fdd9d36e207aa7b59383a27340b56bf739a707e0471a0111
font_01_sfnt_off00011f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F75 17272 bytes
SHA-256: d50bb6c5a6ee07375b35c344f93df69dfbfdc3e3cf50233055ecdbb509a9c0d6
font_02_sfnt_off00014c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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