Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a12b87339cedc2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-06 15:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 28a6a1d2555536cd52bdcfb8972e83d4 SHA-1: c5511056998f1df14e405ff8c3959af13806bce2 SHA-256: 05a12b87339cedc20165c759f8d2f550ecb8018e53cd0bf7a014daada7362546
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on potentially compromised WordPress sites. The primary attack pattern involves directing users to external, untrusted websites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=industrial+psychology+articles+pdf PDF link annotation
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2a1314994---15930645631.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/tekegufugidevufeva.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/defanegevunaladiz.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/29e028a593367af3dd42647ea619f054/92547276396.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/3959428832.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/pevajematexeguzite.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2f4atisnkgvdputsmtv4vr9fc3/kapexunalewipugewe.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b346fc6153f---xonebufopevugidufifatisa.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/13093562491.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/41927076459ee824eeb2e825e8caf546/tudif.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/24204158569.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/uc0kr37bt7qh8t3f2qqssgc4k6/kusumoburutegonakivutura.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/98653816893.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/5246189722.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/8355c8ab92f47afce9b74d496e044767/74167605758.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9f54bbd2c---65675917203.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/bukesaziwinovinefi.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dunonavuremujojunabijixab.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/86763881470.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/90068145943.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mo7vcd4oupltv283vql74ntkl4/sajijivexe.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/badiwabalenekemerijuj.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/lawakomulezivusonekabijiv.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c23b918288f---kojigeboxotojolifus.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_off0000b486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB486 11064 bytes
SHA-256: 14eeb7b6be33c22be8dc6e13d6b3764acbc338f87211a51bb712dfb9a03ed089
font_01_sfnt_off0000ce0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0A 15356 bytes
SHA-256: 83287b13b0beeb51521dd60d3c1552364dd2ea7ad7e821dc67a837e869f012f6
font_02_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.