Malicious PDF — malware analysis report

Static analysis result for SHA-256 142f544f3a47bb9a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-28 08:49:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 004f53caa0579eeba32d28abf77a0e4d SHA-1: fcddbbb3a4ba2efed0d3ec7b4cb82b2502af94c9 SHA-256: 142f544f3a47bb9a532948b9128dadc2a8993d0c34776f0fd2187454b67d27ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://wastran.ru/uplcv?utm_term=trumpet+of+the+swan+study+guide+pdf PDF link annotation
    • http://danguykhoidoanhnghiephp.vn/Upload/files/sanuwu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/sec2hhk6lvlk87rto30o46od23/42673087344.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/46990957602.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/60021151198.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/53145567984.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/54731327590.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27de2e3bc---lugav.pdfIn PDF document text
    • http://neuchina.org/userfiles/file/puxematapupenaxovob.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/26651367350.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/21697498190.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/11049965607.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1c739da59---2048303964.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/21567004215.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3ed3986e5685cfeb4f2d2db1d9abbec2/dokukagipiwasa.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/tipubukuxaravavivaw.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/slracsc9c2vngkpvmnrfnvfgdc/26919991695.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/62071925894.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/26614600941.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/50704844017.pdfIn PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/54830571229.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/78879521316.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/20068200031.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/ropev.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/zegabivuretagamuxafimas.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e1fe93ffe45dff1bebd9524302524a4d/rerumaso.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/92099464895.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_off0000b4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 15532 bytes
SHA-256: c39ee2b58acac6b5522a511156649de926f01c27f711172b66431f3d4e6baa2d
font_02_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 11164 bytes
SHA-256: f673218b98a10fd05e38bde7f2fe46651c01d713bbe323860cc58444912fc62c

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