Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfd90bddf234f9f…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 06:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 024cba671b1b42d6ea2723749a3f8be1 SHA-1: 33ebe96c839427ec41a9b07bbe4bbc38bbd6eeb2 SHA-256: 3cfd90bddf234f9f80ee3b490aa63c613925c25b61e8125a0e4326c3ef26b495
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/uplcv?utm_term=she+is+very+nosey PDF link annotation
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/k1p0js61p0otmgdh5enosug15a/vokoxanafilujo.pdfIn PDF document text
    • https://ambalatender.com/upload/files/33630746831.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/moxawuxosoza.pdfIn PDF document text
    • http://93564497.com/userfiles/tekowukusufareluxitusi.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090af1923296---depexurogekorodesagoja.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/mewomuvupejetefudezona.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///tipokubiguxatofawej.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/porujitug.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/33177174263.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/94234849075.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/wejimof.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/d576880d59bf3af5a2e648fcd0cf203d/39179997366.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ealkhtvtho6tgm6m63pe49pl3e/77922293696.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098d2c6555e6---pidagizizafuxemesedabobuk.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/c3138443995cfe0ed508aa8773ddfd95/24487609871.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/xowifefewelugenopire.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/lupajisipapowifu.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c79e4a784a7---23441990276.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/57734462618.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/21199339378.pdfIn PDF document text
    • https://latework.cz/soubory/40580919991.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/pezulokutakifuwapuxuxul.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/3eqr6dqpq4lgqm5igesh2flmvq/wubajo.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

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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 10156 bytes
SHA-256: be7fce75696d5addefbf31b9b5284a1b6d6f0f14f0d491a9cc66bacad49b1062
font_01_sfnt_off0000cdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFD 14428 bytes
SHA-256: cb7258f6dc78cfe7d0b996a39f5ba1ad36dcc5405a2f6f3aa2add03f89aebc09
font_02_sfnt_off0000f195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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