Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a523b6024b9c0d…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 02:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 43c4ee4b0c2aa5dd7eec5d058225cc94 SHA-1: 0df64f5459704bc6e1928d1c635f8afda7927fee SHA-256: 25a523b6024b9c0d14900052a7a96a411c9a5a87b2ab715776dec948462d99c5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and algorithmically generated URLs, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the embedded links are designed to redirect users to potentially harmful content, likely serving as a lure for credential theft or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d20d8d5fac---55709835522.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160775e67c6e83---fuvebiso.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c698651d7---mamuwoxerefatetekenezodo.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3763607c---45137374807.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/50002621424.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/fesutokujiji.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/91812703047.pdfIn PDF document text
    • http://runo34.ru/attachments/file/15335622189.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2c3011174891e6d0b16af259a565ec49/99673254555.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61c54d32e---8967393492.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/i7clc8gl3sj53t6gmfi3m97un1/lulisuzaworitoxaluremusi.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///xiwujagulimunutoripaxisim.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/26678065384.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/12911454765.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608772d9093f6---8543433460.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc44d58b1---burimudupova.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742690cb9bf---rebotoganonid.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/jadujo.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/10085612523.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091d4f3c31fa---86610649054.pdfIn PDF document text
    • https://wsbtitan.com/images/file/zepizopesikedo.pdfIn PDF document text
    • http://bscartridge.com/pic/19797324697.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/ed883d0ed8d2c4842b272f268c8622b3/46018161250.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b5e089cc3---gonizadukima.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/94904137694.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607903b1d8f87---89762466882.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=forklift+safety+quiz+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 17780 bytes
SHA-256: 8db1d2f3c11e751c65685796eb822d8dfaed2237296702badc0b1229045fba6b
font_02_sfnt_off00011e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E56 10876 bytes
SHA-256: 2c833445905cbe9e190a9ad39a9ca2bf9c95d4266e1f5968fe187aeb1bd1cdaf

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