Malicious PDF — malware analysis report

Static analysis result for SHA-256 874e1cf7cfab2412…

MALICIOUS

PDF

71.9 KB Created: 2021-09-17 05:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 59bdcfddd289914a6a700a49da81921a SHA-1: 8d46ae0e07758b20c3ccbcaae0d571198aa07593 SHA-256: 874e1cf7cfab24127cf253d23c353e9d7acd74dcc27ce5ff9298e73d2a068df0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malware. The presence of embedded URLs and the overall structure point towards a phishing attempt to trick users into downloading malicious files, potentially disguised as software or game mods.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=download+gta+san+mod+apk PDF link annotation
    • https://livres-arts.com/ckfinder/userfiles/files/rojonazexugitegux.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161340da2cf828---pifajodasowobepotepiko.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/lemejadesokoder.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/39240230663.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/903992f78b25981ae58761269d7425e6/lelogoposul.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/87942296412.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c8734a026ddc7717be1b2da4ff6d9c3b/64395662600.pdfIn PDF document text
    • http://ledins.lv/cms/file/57613860433.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0fc2f1a970d4a644cf191c45b0bed813/miratijowelosubuj.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/46797548968.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/49074072196.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/kerazubonibonipowetezak.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/21518093374.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/jojituduraxegibes.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a5afaf8bf---73036701974.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/94680938730.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/63333243681.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/kejafovezuxawivegi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fcebb48e58---kowotoxuzuretepevoruso.pdfIn PDF document text
    • https://zagi.hr/files/fugoxebup.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/vutotexefirobuji.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16141843b4a314---kutifa.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/zijokemozupugaguvife.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/metunez.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_off0000b8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DE 15968 bytes
SHA-256: b761d2ea7646fd5acb3af6d4ad5ec74803513f9b1f92c4f6fc5ecfd49c378557
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 10588 bytes
SHA-256: c0398f7c18b66e96095a2019c3551d3fc57b5cd68a107fdd49ef45ea8af50068
font_02_sfnt_off0000fa02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1