Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a3970607787d10…

MALICIOUS

PDF

75.1 KB Created: 2021-06-28 17:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef8995e0c8e0d62c03ea057cee2b0e6d SHA-1: 1e621c71744a12f2441388957406c2c5ef7cbaaf SHA-256: 27a3970607787d10b3de9b1e7d0b97e4dd250471ceaa09b20b7a368048d5803f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm, with many URLs pointing to WordPress upload directories, is a common tactic for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=masonic+and+occult+symbols+illustrated+by+cathy+burns+pdf PDF link annotation
    • http://marymo.ru/uploads/files/sumogukewidezevev.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5934b93faee67fd835eef0133cd5eaa9/79488556415.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074264968ebf---92503208860.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/anknn6fa4pfa7709dbk1b1dlnd/jiwotuluwivapolib.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ef997127e---xewatufubevimipixexuter.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da162949a2---30709204719.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac79901deb---fazorazusufosoxabur.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fb8035d3e---finilatovegip.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608513a082c91---gokodajifum.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/97405384662.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3409dad122ae26069c02f7156a964964/dezixedetot.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/21743861560.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/vikubapabusibilapuximap.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/b39326867fb4a717fca17f94fcd3bb9f/rusivekufakobulitixofiga.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/8885372061919251f61cdffd366f9605/mupezed.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1609c482771042---28073328129.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724639146d2---sowegetu.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/6472128915.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/de962478172be97c05dde48b601c2d4e/19414281023.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/dunitasuzin.pdfIn PDF document text
    • https://oversaslogistica.it/file/43924421007.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/un52469ivp0fcrd2hf84j8u6b9/13653814957.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/cd4b76df2a0503541198bf3bbe424d5f/97054140363.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed683d964---tefofifuzuwabejamu.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_off0000c381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC381 11232 bytes
SHA-256: 6cfd66f614cc003fcb17d92dda289f9c1fcd1f423df676117cb5b47f9752417f
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 15840 bytes
SHA-256: d623a94feea075f5dbb020fea2114913d900b6904a0c68c4d2c2a1048925d2ea

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