Malicious PDF — malware analysis report

Static analysis result for SHA-256 b713e2919044fb84…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 17:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 545566a0138c260ca12acb5bf0bbdf1c SHA-1: c755a372fa58ca7fb4108ae73d0220c423ba6a7a SHA-256: b713e2919044fb84d0ae3128ff4f62745bb52bed301a825c9389df581eee5007
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74b9cbe5a---tegejagiparuxubelituz.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/58q1so3nqhe02oihuf6pgt0hlv/28174840426.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160776bb7bd458---50182492807.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/43732331858.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/98282184483.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aec524dbe38---3962513587.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/sapisafonilalave.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/b52c92b13bf185bdfde4b10aef379bd6/79211977169.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/74701101592.pdfIn PDF document text
    • https://norservis.cz/files/files/94922298276.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/45457266638.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/50344237617.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/jubumavoji.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/xakefasazuvazaviri.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/7b7cc03bed0feadf00619a02ca994c9f/43676632852.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/55273152725.pdfIn PDF document text
    • http://limoride.net/gallery/file/duxomufixuf.pdfIn PDF document text
    • http://talleresjpg.es/img/file/sopur.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/mevufupidirujumolewonaz.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0676fe5773---kekajadotalejopixewek.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/gimitowi.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/povolikefegekabelof.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc41549467---87112718549.pdfIn PDF document text
    • http://precisao.org/files/files/24020759335.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/3295962606.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/jizijuribexelufiren.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=diplomacia+y+relaciones+internacionales+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_off0000b90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90D 16212 bytes
SHA-256: 025d8da977b6432ea01add714530b9aab733413a17d9c7689cb94f6d187493ed
font_01_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 10896 bytes
SHA-256: 502f627591f3ef133bfafd682f18942c1ebbdf71856a4dad04099c5587a0cd3e
font_02_sfnt_off0000fae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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