Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb80c1d606f2d73…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 18:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f6b0322e5456b6dd877701c3aea24afb SHA-1: cea83a20a815dc9f2a976271aa3f0819730e68ed SHA-256: fbb80c1d606f2d7381602eb36dcef61b06a9795e729b40ecb9077ebfc10c0b3e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The embedded URLs point to a link farm hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://crysiq.ru/uplcv?utm_term=vizio+smart+tv+manual+48+inch PDF link annotation
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8a6ed4e908---47710676484.pdfIn PDF document text
    • http://fhhsclassof70.com/clients/4/42/42ce21dc30e429aa976ba070b22ccf93/File/7392092653.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/86437477047.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/95330462171.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/eac22d9bc0d934a5ba13a8564f8fbfab/xadapitemoparanil.pdfIn PDF document text
    • https://szud94.hu/img/sajatfile/files/42838871097.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/fufolixixu.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61ee4b459---vefusi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/3cd474c8e39342f6c005947ad31c33a2/76742763950.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/470f0801d4124ae151b87ed2c5bded12/visebidusuwivuxur.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160889dc10116f---59215065843.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a39f7d8d8e3---98606957311.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/jazagorulixopafewuwakezu.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/mutalumavemobakitolutime.pdfIn PDF document text
    • https://melz-feu.ru/upload/6622756957.pdfIn PDF document text
    • http://freeski.hu/freeski/file/zowoguralaj.pdfIn PDF document text
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/ji721qf58vr7hvb16fpo5gt5aq/74304348444.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/64565326228.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8e4297c6---rupanorugarumipebow.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/rigelijogodokesapumirada.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/a8ac4d8ad46d4204501097761c3a0b63/vipenasuditovopokepikowep.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/45ce8c10adceaeb5c0a54c234c3102f6/37504347139.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084930f6e6d2---pukosorusoxop.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_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 10844 bytes
SHA-256: a4ea2bc24656903cedce1483297ae71c228dbbcc354a5f5596f1b18cbcee0d15
font_02_sfnt_off00011187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11187 18240 bytes
SHA-256: ef0e3d979fc5a80feecbd8cad21aa90023e92cd98ffcd817e651a1be77be8851

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