Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5e08a7bfe392129…

MALICIOUS

PDF

71.2 KB Created: 2021-09-04 05:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32bf5f0915f84b853ea78a4b66955357 SHA-1: 12403fcf912e8f5e8ca8f7a4f020807bb03815c5 SHA-256: a5e08a7bfe392129202f877ebb64e945cea702a906545ca0f16784fffe9c0c8e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=ostrich+algorithm+operating+system+pdf PDF link annotation
    • http://www.corazondelsol.es/ckfinder/userfiles/files/gejasatitutabezanubo.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/96495026786.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/2fqbv9jc3uhq1c4tabk8u6h4v5/24441366037.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a99c7149---18374538326.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/g04u457etkvghfh74eumlm78q1/gesinawegululemi.pdfIn PDF document text
    • http://donghobaoan.com/uploads/files/15470359694.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/0c1e338c50be88383047cc82de097e2e/96391429640.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gedokelin.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/sudonajutipadal.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/lkdsss0o27jaljqbdok6o24rd6/bokigizaxodilajag.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/dakivalusovimatogapigenul.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/27533705440.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/17413097445.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079015acc13f---sumokajidegikobamivokabi.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/14291619381.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/upa9cdqoljeersgtvjr2j7vl60/gegosizulogavu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jodur.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607739ca21b91---ruxorisoneruwupukutat.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/97174642055.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/63620608330.pdfIn PDF document text
    • http://mega.kz/media/upload/files/kegulibupetaledejirilil.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10c12d851b---panipobekimadajo.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_off0000b571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD88 11208 bytes
SHA-256: a5bbf7b29e07b6aa61f518b43afee56e6b1c492dcf3c4291f0169ecaef8ee49f
font_02_sfnt_off0000e76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 16100 bytes
SHA-256: 51e590f3787e3a21a7fb06af629b3ccba97d0b86d0ed639b6d77bbc85979e0e8

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