Malicious PDF — malware analysis report

Static analysis result for SHA-256 982083f98fda5437…

MALICIOUS

PDF

94.7 KB Created: 2021-07-04 02:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d327192f77c882d2a2c07076230e24c SHA-1: 6fa6af824f488c60c7c0ca4f300455b50799b770 SHA-256: 982083f98fda5437c72c446335cde08a981daae02606c69c69496be3b1406017
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate an attempt to lure users into clicking them, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://laborke.ru/uplcv?utm_term=nac+is+good+for
    • http://abwplazaview.com/uploads/files/gexafelokag.pdf
    • https://gemwares.com/userfiles/file/fexufarevukomupizezab.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e8fd1ced7---xikifexubosem.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724e77a899c---zavatowisoxabus.pdf
    • http://frezerovka.by/images/fxeditor/file/34772777702.pdf
    • http://meandnetworking.com/ckfinder/userfiles/files/15100243130.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/70006bd8401332c7935e574e1bf6fd50/76004743469.pdf
    • http://korean-school.hu/hangul/userfiles/file/gemox.pdf
    • http://learningkey.org/userfiles/lujivagevareku.pdf
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/d98a66fcaa76e911ccaadf089827dc73/muferagakikobigazokake.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/661a0d49dad91700c98cf200f1b147fc/fomirovuvoxuwos.pdf
    • http://esipro.fr/userfiles/file/lulimerurowaxigurelar.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16096a55ef2e02---80037923064.pdf
    • https://tectrongim.com/uploads/files/sepik.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/a34mvo4422un38q7g8c41cqrls/6661932598.pdf
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/8626325814.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/76452873871.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/5o397aca9pmulp0bniotrqqei5/vovov.pdf
    • http://houstontca.org/Content/uploads/files/75277103811.pdf
    • https://www.alapan.org/fckimages/file/26246970751.pdf
    • http://botosani.ro/img/uploads/file/luvebemilabele.pdf
    • http://bjjiffy.com/upload/tofagopepapasobivasob.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011170.bin
149675c7979eaa4c2d7f3be14604acae6613a50ccbb689fd87435dd20d5d38dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 17380 bytes
font_01_sfnt_off00013ed6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ED6 16792 bytes
font_02_sfnt_off000156ed.bin
be791355e16d00d2d863af4e1a4283b9a56405512607d2ced9432a87e0e47b7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x156ED 10248 bytes