Malicious PDF — malware analysis report

Static analysis result for SHA-256 880cbf7781a78bd8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 07:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7d4589bd965a1a923abb73250f2cd01a SHA-1: 1cafd5bc8e14c56d900911b87f953bc8dd8fd905 SHA-256: 880cbf7781a78bd8cfa473e1aa45811962f3c7219db9a61e0182cac9122a5218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links to various websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=the+walking+zombie+2+cheats+pc PDF link annotation
    • http://thietbimaugiao.vn/Images_upload/files/72194889393.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/65082787895.pdfIn PDF document text
    • http://wdnederland.nl/file/jokuzuditafapaneze.pdfIn PDF document text
    • https://keepingscore.org/userfiles/file/69063131207.pdfIn PDF document text
    • https://tigaintan.com/contents/files/rigozar.pdfIn PDF document text
    • https://edgecs.com/documents/94971539204.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/zokipigaranimuninasopadad.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/4663023254.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/fepajibagebojelesob.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/18084934656.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/fifovizi.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/71493364828.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1cbaece3---78505846374.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/67535634264.pdfIn PDF document text
    • http://cissi.it/userfiles/files/legosi.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/vadenipini.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/wabirixipipa.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8dbb76878---xotelatavuxewemagex.pdfIn PDF document text
    • http://greddy.com/admin/common/ckfinder/userfiles/File/90899777610.pdfIn PDF document text
    • http://gardatrans.com/content/Files/28800072168.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/34406137227.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ad66a9e5c---54434635613.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7s4fb5jqhb34315eu8nkp0jl3p/levuxivulenetifigeliw.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/83532078269.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_off0000d99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99F 18320 bytes
SHA-256: b9324f84377a3d7fa05a7e938ba570bf4ad906e38478bfad74160b7d431b46d4
font_01_sfnt_off00010919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10919 11180 bytes
SHA-256: 4717cda339e94f36e7fc0a0c179a116025e3f1ededa109e4bcf5ff8bc3650d5a
font_02_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1