Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fb5c3013fefa423…

MALICIOUS

PDF

88.0 KB Created: 2021-08-08 21:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8e1d1ce5ea926b850a7c9093cffecd2e SHA-1: f1d50fc598f6275e9e580afe3e3df031a8b283dd SHA-256: 2fb5c3013fefa4232a269a57cf8590eebed7c7fae7abdee50356bcd7e951b040
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. 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 consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://queure.ru/uplcv?utm_term=types+of+independent+group+design PDF link annotation
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/79bf7424ce834987b8a760e8712a8449/6578178988.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/timijalurigu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b32c71a0a8b---tegejumapugatoratukegiv.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e9ba70577531660c2034eab449c2b158/10829367060.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/duxujilimugawiwokosifal.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/wawadevedokowugiduxekiwiv.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/bovafizeporuvidipivov.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/xojanejinavexer.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/14587804662.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/76205241861.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/7360820570.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d71b62fb48bbcfead5ff9c576962dd6c/92001934684.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/22311201509.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/d057f36267554aa35f0e1dcdd3a38578/3981639836.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c73a4afeae4e113bf2020e2f5436b9a1/2427624673.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebad106b44---nabaxifox.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/texinuf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/lbshme6epju57fld2nliaps5au/94538751174.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/5627478226.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a3fa8b43---3386607693.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088846a3d457---zirexojedudo.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c01deba7935---xowazikevadikiwinaji.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/83843286629.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160708473a5d64---vorulitexovulesefisowo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2bab2a021---fonibuzepe.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c232a988150---lajarosobelesebel.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0b610fdc9e09d63c2cd5119b3cec986b/80186875295.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_off0000f48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48F 10644 bytes
SHA-256: d6381c8fd2a3814e61a98e7dc3cd99d9ab732c532483b529e4d555e385751688
font_01_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 17004 bytes
SHA-256: 95485bb95816343848bd000335aa6876a98ba0e6a35b6a8c18c66fbecd3f603b
font_02_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1