Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd56810112a2bdc2…

MALICIOUS

PDF

89.7 KB Created: 2021-07-01 15:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0ce97e4ab1543abc8177998c1def2af5 SHA-1: 276a6337d2a5bff9a46e65df7dff81a73696ae07 SHA-256: dd56810112a2bdc215f52b11933be052ebb726e6fd387a274cf6d577f7f1bb96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs and link farms pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the structure and numerous links are indicative of a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://queure.ru/uplcv?utm_term=ksi+and+offset PDF link annotation
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160707951e1b8c---49133237847.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/sfkqj7d560cs2l36i333thg4v0/guxemaribekebarov.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083f10bea8ba---rejemowopipexuxukopa.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/eb37db2290ec0936e1a766fee2fd9c6b/netosog.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e48276d0e---tasozinugoto.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vidifomipuve.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/1a3ccdf67be572fdffbb9459bbc4da01/pawikemobesoniraneluk.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160845974271d2---5810891447.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/38052453863.pdfIn PDF document text
    • https://norservis.com/files/files/xuwabawilovuwugeleniwu.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/m6m3ai8f7oa6eb9k1t062fms5d/sodamori.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/44725577423.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/2524565716.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/gejudiba.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210602120327.pdfIn PDF document text
    • https://isosklo.cz/uploads/53967408387.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/aa40771911ba681c5fe51be8b4a8f54f/vowoziresijedafekika.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/914075554e33f94cf1f28f05bd8ff0b7/35403457755.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/2lroe57ku5r1b7jp6knq2mpd6k/pomusaxidobesemotitusi.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/jimafonetisebifikuxejij.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/57712456094.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ced865ecb7a---wumodavuzemuduwowakuji.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_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 17524 bytes
SHA-256: 2ff2aa3256f287a722a5faaa07babd22af42d7503a3f955a40aaec3b038787c2
font_02_sfnt_off000141a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141A1 10192 bytes
SHA-256: 1e06ed0c0754013129b3f14c11284b2f94170bbe58f1a3e8b112d167cf013b18

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