Malicious PDF — malware analysis report

Static analysis result for SHA-256 459cf80f65eeb47f…

MALICIOUS

PDF

73.6 KB Created: 2021-09-17 13:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5afb8737ab3b4842cf479fdfb3d155a9 SHA-1: af878347d74018dd747f176ed67766b05373a7eb SHA-256: 459cf80f65eeb47ff1fc6f4ebf236de9dd6ff5efe86afa084268676337346898
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple external URIs and link farms points to a tactic of distributing malicious content or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=nba+2k21+mobile+mod PDF link annotation
    • https://syteq-pro.com/userfiles/file/12127258289.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///zojuzobezoxofoxifasuwuf.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/68477799035.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/41221283849.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/ketasime.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/xitaxumufajexegezara.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/regezamuzevuzisuxaxekiven.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143790c10b21---43192997496.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/gukigowos.pdfIn PDF document text
    • http://jafra-com.at/userfiles/file/55493907207.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/fusejajokawa.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xobezudutal.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/keroj.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/161412ef5b8f10---jirozisijinewogexaxizojes.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/pajuzojuzelozazivuzuzeman.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/37798517035.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/57895921660.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436324bbe08---rurirabatibipagaxopaguko.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/pazolezabulonut.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/47578082a7079bb2c85f5fd29c194cdf/samowixodaxekabo.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0019882eb---pebiragafijekufivatetiriv.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/75685777458.pdfIn PDF document text
    • http://skia22.ru/pic/file/tipefenisolevo.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_off0000bd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD55 17200 bytes
SHA-256: c1015044f410bb0ed8ec272c5260e0455d0911d5da478eda0b57f9d6d25480b8
font_01_sfnt_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 10320 bytes
SHA-256: d6a06320b29d2a0f389918b54d12e182d245c3027e8647dc2055f0264409a859
font_02_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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