Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf76fcb455f59bc…

MALICIOUS

PDF

86.9 KB Created: 2021-07-19 02:32:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 59ef75583326aeb6fddc466b9ff6aac2 SHA-1: e0f761df9242b70ab178f89616fd923dbe36b855 SHA-256: fcf76fcb455f59bcf54fd0767b8a9b5c7d6e480c99ecb252e83e9f2b7470f200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/89391efc7e100ebb87f6609d75495c07/debuwuraxivomuluwo.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a89d04b09f51cfddbb746d6fa8b901c1/13273143300.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e69eacb1563---zepitikiworusoxovadiri.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3643b9d51---vegoratutaxoxunem.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b86ca3cd1b3---pusadoja.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/91255194220.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/41652831889.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/nesanexiwog.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/vexuminodozigig.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/101249013927.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/73228990535.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/7eae0701df31fb8facec2415fa7a244c/24023615991.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/tezufitaxizebadosik.pdfIn PDF document text
    • https://sce.tw/uploads/files/60b7538975d44.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790a6abab76---58119935485.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/pirulaxuxidumugepitot.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/zuruxusipodikegizowax.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646b8ae454---39961901700.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/13839444672.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/72dc52fd429726a0c9b3488c04172e61/60798787686.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/12621153635.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/gikigoj.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/xuritukipaxapiwes.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/34472602413.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=eye+twitching+every+dayPDF 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_off0000f348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 16576 bytes
SHA-256: 5cd6e91cb63fcfbbde17c01c4f8730cb61dd15a416548554e1461f72f0e7cae0
font_01_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 10564 bytes
SHA-256: d4861762b070f69b48f35d67ae97711de41e18fe34b93a6d1fb2ea69adf1b86d
font_02_sfnt_off0001360b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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