Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e90723db3ca4ac3…

MALICIOUS

PDF

71.6 KB Created: 2021-09-27 22:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 770bdb3ebbea252c72cca516be9c07c6 SHA-1: 23ad8534eaa900dba83e05323f535ff7c7459307 SHA-256: 6e90723db3ca4ac32fcef6651b263ce1e56da1df6e55dffe5e8fdd3acd097ddf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URIs like 'https://drafthe.ru/uplcv?utm_term=tiny+titans+apk' further supports this, as these are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://drafthe.ru/uplcv?utm_term=tiny+titans+apk PDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ecb16b55b8---wugigur.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/magexikikebijejokolori.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/zavavilakiwamawenir.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/924cf51e04b346d628c2bba947021718/wosifanegedaxibekuge.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/24170297891.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/zolalegovipinonogulux.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/madaginolipojibale.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/jozibamo.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/54845388676.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/zopijatomunutoponejerojof.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/62389796850.pdfIn PDF document text
    • http://jinyezi.cn/upload/13894368960.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/61468605546.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/dolukuvimodilibureralemum.pdfIn PDF document text
    • https://cape-electronics.com/media/file/gavidarive.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/mizosopufabupifupojomelo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebeb9aeee8---86849761099.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/l4abvih18llvset4fg46lqpoha/vikuwigabat.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/zexuwozu.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/60b1f2acd9620d77444789a9b8e4518e/84112826395.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/81590549562.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141c8b95a695---nigabegesokopipisajimevag.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/76407552472.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/17157467787.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/8393067226.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/60237993296.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_off0000b5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5CD 10016 bytes
SHA-256: 1f0d6602ca20ec3cf503dc66a97cbcc64967c1ab8f0ffee537bd8871fb5aa65c
font_01_sfnt_off0000cc29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC29 17160 bytes
SHA-256: e22b3c9c3a90d4a4360e52b1cc861288256210174941db278142cebebf04e4a4
font_02_sfnt_off0000f8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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