Malicious PDF — malware analysis report

Static analysis result for SHA-256 19af2085b59ba19d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 19:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c68cae261384420ec48acc28c203d0d8 SHA-1: dfabfd79710b47232a8665d42fb9bcc543375a83 SHA-256: 19af2085b59ba19ded3208361486d93e3ca064cc7c093ab7433bf64cb495a772
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on potentially compromised hosting is a common tactic for evading direct detection and distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb9c82a36e---54539754734.pdf In PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2sj3is8qhud68b57lpv6ttt7a6/58951882954.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/39457725504.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40002123672.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8655daf68---jusekazepakitisogameloveg.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/24257329257.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/94947d3fa1558a45687028d1c40428b5/falopepas.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/bd00c5e90251a591103146ba32eb9af9/volilaziporujiseje.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/jtoe7uqqeibl1kcmgfk4p8geem/valifuxurinolugovawalupeb.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/34877317025.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/gakuzefujer.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0844b90c90---vofefesitufutoz.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c2f92e5536a652897f3d6b67dff0d988/84611010673.pdfIn PDF document text
    • http://lejuriste.ru/files/file/67637318910.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///duzodukadodemukul.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/ruvewoxofi.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/jomuzedezotujumesuvutuze.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a42dc38373a---57768917817.pdfIn PDF document text
    • http://mobilenmr.com/files/files/widepiluxudabije.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc548179d8---firumuveju.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/nebolovevepokaso.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/26176243411.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/572832a1118170a22f924bf575f1016c/dajejita.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/81e94f2ff45d18ee29f41e835a26faba/24572879697.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1b0a5958---nojojotudafivo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e226e5ad18---fusejejilapidubevakolade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=participate+in+meaningPDF 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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 24192 bytes
SHA-256: e8d55f38be7ae126a5580f15b8a891ab49d0755acaf2ffe3307f3c7eab105469
font_01_sfnt_off00011078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11078 10384 bytes
SHA-256: e771efc12add7da6223dd5c2cdc83ce7595d222fb050abddf33a4fe6431f9285
font_02_sfnt_off000127f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1