Malicious PDF — malware analysis report

Static analysis result for SHA-256 7def892671a406e5…

MALICIOUS

PDF

87.7 KB Created: 2021-06-26 01:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 32f9b8421e82c0fdb1e62d2fca25abd2 SHA-1: 81698a109dc39602b1056d88fa8af7e7d0164a6a SHA-256: 7def892671a406e508bd937dd02cfdb047b18b840ff282364e8d91e0e76859e4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The sample's structure and URL patterns suggest it is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=what+is+a+developing+nation PDF link annotation
    • https://genegurumiraclehealer.com/userfiles/file/98494567977.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/86054229514.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/97506509231.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/0f3112838215146db4d6d0ad7e47ffa5/98347372655.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7kb23rpqoo0907esmhn3p4sb4k/zanavupufit.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/30031102890.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6078d5323---tikedexiguwopuzu.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/56224747702.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/98a8a18beb890818d681c03a8ace4571/ratusikovifom.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/siwigap.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/nors8i4ur9p6q85aar7fpmffhq/52097705969.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/magasorisufi.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b5fc98302---rukad.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/wowonepo.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/dogemizejujoz.pdfIn PDF document text
    • https://slide-bearing.com/d/files/19130689172.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/kodilaj.pdfIn PDF document text
    • http://elm3rad.com/file/69552169567.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/39347071654.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/032ce5d07cc9c172295c0c3826163680/roniwujupigidimab.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e9d4752f1---97640050671.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/rilevagibofuza.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef8a46cbd4---suzitekasaxurejafedazi.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/jezurotebiveruzarakilode.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_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 17192 bytes
SHA-256: 637526b5d04522388ede84e6053d130247d22fdc912a07d6be3783f42a156de5
font_01_sfnt_off0001217d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 10632 bytes
SHA-256: b9108cffab1fd4f7b1186dd7877297619672905f8c8fdfbfd7a020a9cfdb5f1b
font_02_sfnt_off00013993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13993 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1