Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fcce1551931fe5…

MALICIOUS

PDF

156.5 KB Created: 2021-07-03 23:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: a2bc134ea2a63094c730d1734fda9612 SHA-1: a27435aac2d06b9050efe9af6e0c4ad624b57518 SHA-256: 37fcce1551931fe5102bd7d1fffa05a5d467d77caffa1926c6b40c44875feef9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://infrive.ru/uplcv?utm_term=consciousness+spirituality+and+transpersonal+psychology PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081972ebd207---54249337124.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8ca048657c25674a088a800a5518493b/rakomekanefejirin.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/ragabowala.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/o1e8m7s8ai1op5e2cq4tk7lu64/97057337590.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf045767e7---zumufovuwasalixerawiliz.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807defb3670---xepuruledizogezaneb.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/xenididak.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8f1832e5e3a837fb68e7a945bd12b229/54931607249.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/i3eg0vuevbjc14h1qs2vil19l7/54811654195.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/64d6409df0024814df029d49483a0063/kexazapifipized.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a24951c18ea---baganivajapopudepok.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9d23f11e---9853371419.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/dbf97077235f0c9cbca0a8ad0965f61c/44226536559.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd4139d98---muxujidijivewava.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070db3c61e15---78141939700.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/buxobisijagipe.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7293879b4---56190560739.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/2505907517.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/6069c805a3a8d9f68ef56fd19fd91c6a/19648777805.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/91132632171.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/1fda51bc39c12a982e85ccfaa2a6a06a/sosopisaleveboxojapogoko.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd7fb3c43---23697306590.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/58854283100.pdfIn PDF document text
    • http://susutour.com/userfile/file/50988539238.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/pimumazugabenaxugi.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_off00020250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20250 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00021a62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21A62 18148 bytes
SHA-256: 2be6b913eb710a757a517b44e3aa5b6d84c3fe577fa67047579d039217306762
font_02_sfnt_off00024a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24A26 11036 bytes
SHA-256: 075f7daa01f6a38687ea8df963a071b4af28fe789bea67094769f3c418a1349d

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