Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a8617ebba41a5c…

MALICIOUS

PDF

81.8 KB Created: 2021-08-31 11:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eb13a4fb7f03be0bc8b83f618c41e460 SHA-1: 17fa4d16b2cccf8207102ca49204c027b4c76051 SHA-256: 07a8617ebba41a5ce4f9b26f441b0b7dedc488cfc60310ea28286d1aae2e65d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to redirect users to malicious sites, likely for phishing or to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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 http://www.tobywells.org/media/fckdir/file/88254685122.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/rsm90310vhdd2vnk8aps7lrs02/tifiko.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7e770c839---22389239495.pdfIn PDF document text
    • http://unsersohn.ch/images/file/54007205223.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a323dc669f6---sagesekodifasid.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1c82o4irsd11on4rs9piaefgap/saloxufixirugejajedil.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/mpddcu1vt29onms6gpfb6cdr93/51899768968.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/16fc138215572b06ac20c511ed9f6199/49264959163.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/dahkrjjhgqifrmf7in0qunli91/44163895333.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/jotesizo.pdfIn PDF document text
    • http://fittbike.hu/files/file/77614302008.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/081620303007.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/88976286267.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094062ea22fc---37213048765.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16078e486b7300---pesemefaxefogirejum.pdfIn PDF document text
    • http://9275522-travel.com/userfiles/file/75188505089.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/98268664150.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a05772f014---66683639692.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2b163199---givefari.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/92422506216.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/5ac375f30ce606cfbe17aea7061042ed/95841608871.pdfIn PDF document text
    • http://24cvety.ru/upload/files/kokatawakev.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6d107953b---12939923753.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f850d52de1---fupudegu.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/4f8d39953dd4b291f461162d97ccfb6f/liloguvexawoxex.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/gomiwipuxo.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/98401111769.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=words+that+start+with+b+and+end+with+hPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 10516 bytes
SHA-256: e3e3b2bc8136b86fe50b65eaa9c02428d998641c3d71c02eca5d63151116c0ae
font_02_sfnt_off00010dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC2 16336 bytes
SHA-256: 7a26f42907d65e573d6ca830171d22a8e6523979ca3042c30a17a7f0456bb3b8