Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fb7b9b57fb77d6…

MALICIOUS

PDF

103.7 KB Created: 2021-09-07 04:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3fabd4fdd83a18cf5c49a76d098b768b SHA-1: 6f480fc1921a7a811907b92a05f25435f349a98b SHA-256: 04fb7b9b57fb77d6437abd18469726855efa3993aa4dabb301b1bd2741212aeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://pistant.ru/uplcv?utm_term=terjemahan+kitab+sulam+taufiq+pdf PDF link annotation
    • http://abwferrellpkwy.com/uploads/files/5851900950.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/flivjto4l49vv1atqhobrdcqr4/69151738143.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/78900651100.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210702020952.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/dcb5c31d70fceaad697c8bacbc6cb20a/46029792635.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/banivalozibogujiwororat.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/jovodurumotokirup.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613252e6c2e69---36227869268.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/88200283590.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/99925658028.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445cce66ea---76546794892.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/15996374728.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/95307109224.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/96f7b2684e13c1b2f3eff20363c180a2/mevijexinabisubu.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1kg1dcit82rhm3erhu7caro1bc/bokadixosodudajiza.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/kelinuvivababesi.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/07d94acd31b99fbd7ab1dababac5f98d/nevorosuborigar.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/67159522625.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/dimojusukubikijedipejit.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/mifegitagemefugorileniduk.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/jedefitubumexono.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608211b52b13e---bigosopo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000117e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x117E4 30216 bytes
SHA-256: 5544339a3222f131e8e48bd482cae0ec06636edee943a8e9896fffa547d36c4c
font_00_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 11212 bytes
SHA-256: 9e25f1e1365f46747cbfbd6926154811a25ccdf543e97b044e8b2313952e557e
font_02_sfnt_off00014ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000166d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D2 16280 bytes
SHA-256: 3e44c4ad5b0ae38c9976449aabb5f463c548e9a3ef8d4ac07f1af89edd0367fe

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