Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4ca8b976b0e147…

MALICIOUS

PDF

76.7 KB Created: 2021-09-02 02:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4ee1cd366bc8ebbf8e3c1d3a2b10f605 SHA-1: 389bf3b2b0c64dabd36b01ab41468aa8d37e66e3 SHA-256: 1f4ca8b976b0e147d6f41d2b8b1ceabf383c8f2484df8ea815abec02a5ccde6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://queure.ru/uplcv?utm_term=how+to+solve+the+remainder+theorem PDF link annotation
    • http://reelproductionshd.com/userfiles/file/30841826738.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/68492921855.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vonagaf.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/51bf78b9a855d06b484c55b72eae7033/64831422383.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/vovinaluxobobanulibi.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/80905134740.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098557986363---xemoz.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a130845e999---labaxuxoki.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/99483024124.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f14d6f647---lanivuwakobewatel.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/mujiwafixanoxutazezuf.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/62594632829.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6f3472c2---bawaf.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/34083273495.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/42358002687.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/12541891829.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/14430873781.pdfIn PDF document text
    • https://ibextrail.com/editor-images/20121335348.pdfIn PDF document text
    • http://wawa757.com/uploads/files/fonalonitujas.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/42273171889.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e72fa3a76fb8359c23e1782fb4fc2e44/31401210120.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/339e20dc1c8376909003602df8b3f4da/wizurufefuviz.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/69236688704.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/jamebisepapi.pdfIn PDF document text
    • 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_off0000c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53D 18028 bytes
SHA-256: fe6bb129179a63db701a60a30dae8a94fe1a7bd6339c94800aec88074b0a5b00
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA9 10656 bytes
SHA-256: 198103b0a479fa9fe64357eeab2611ef4e2088c33814b6de1b1339b2c3a2f7fd

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