Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a1ed54381953e0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-07 17:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 14773b48eb253c02239e5c7a61ec973d SHA-1: 38bb7f0713317412c37549b5c8f46586f42ae084 SHA-256: b3a1ed54381953e06c3b80093e9f6e327f5a59f259b262febb815eabb7950a64
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary purpose is to trick users into revealing sensitive recovery information, such as private keys or backup codes. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the lure suggest a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://wastran.ru/uplcv?utm_term=hidden+camera+clock+manual PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ot4048vscp1ecua5d7tjlhgvo4/wasejizudosuvozakudolivo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c950df9ff6c---31736806875.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/zoparugarogofulojizoboja.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/xajekarala.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/31219065235.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd663c0897---46377968974.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091684f9a3cc---zipenesanatabivogazuz.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/76833038778.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9a06923266b54004d86e05d751104f8d/kadulija.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/bbci5ug6aljpssg1uff2as8brv/bopexawipin.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zunawenesabukifiwavamelur.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7a0e3e8ac---xopulusubewerixezigod.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/paferezakupelu.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/mawoziridu.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/99728573142.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/63t6jrip4jiei02benvlg5l32i/jajosewarukuke.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab60595c4ae---26741777180.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/67782411772.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/57851653263.pdfIn PDF document text
    • https://mojer.bg/files/85430563168.pdfIn PDF document text
    • http://sxcec.org/userfiles/file/93561087060.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9ac0a67f86b51b2cda4d634707e6ad51/xenezipirawu.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/d06586dcd9ce919a922410a0fbc1b1ac/55340721466.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_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e83f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83F 18960 bytes
SHA-256: d21891c5982b258c71d9dead6634535b6bbb3488dbb25a28c9a292d97ee6a22d
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 10448 bytes
SHA-256: f46bac283a647bd324d7eeba846ae4b53f769cbbc7efa1d95563655fc7c7ecd8

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