Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb61b024dbb550e…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 23:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4727b9190ccb82ce8a4b0ba0ff0f0aa7 SHA-1: 2ef71c8e6f41326bdf0c33246725523847c2190a SHA-256: 5fb61b024dbb550e83023f4e528aaf0785f9d84fb062215bdf9e67b63559e21f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. The primary purpose appears to be SEO manipulation or hosting malicious content, rather than delivering a direct exploit or payload within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ilyxrace.com/userfiles/files/zugarepanidipaxu.pdf In PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/185b7f058690ccba361e648fb17fce1c/bululikesuxesizinid.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/1658327153.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e9b00bad---3624642679.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/20675177890.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/i4oe4b09bbihbn0p7pr8vjpdn6/pawipalolidawivegi.pdfIn PDF document text
    • http://otohonda-phutho.com/upload/files/21047850156.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/medagiribuwivomofupugur.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/63684544953.pdfIn PDF document text
    • http://fxmeat.com/upload/file/9eefa3fec8717d56531ad0a951670243.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/zeviziratotu.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/68966882658.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/915pbomcjk5sugvtbfvookm5j4/venarofesuvoruwogexela.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/sasukewozovoxejoledusamu.pdfIn PDF document text
    • http://suttonoakfarms.com/clients/880813/File/zewugoge.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/63033952753.pdfIn PDF document text
    • https://tsafar.ir/basefile/tsafarir/files/87489335653.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/51126141177.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e815b7e3---jajudogu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/30887295788.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ff423e888---xubekera.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/nagefodowawabuwuf.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/76670843177.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/pilozusemosikuve.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3fe54dd9dc---gibununonebul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=estimating+sums+and+differences+of+whole+numbers+worksheetsPDF 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_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 11324 bytes
SHA-256: 9945798e754faeea1dafdcd5b3bc87a658f5e7ea42324ff100bfdc4b5b8931c1
font_01_sfnt_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 15776 bytes
SHA-256: 1d0850a10313261988cda9a5b7fc8f9f77370404e1aded9af9b1351e7e7906cf

Open this report in the interactive analyzer, or submit your own file for analysis.