Malicious PDF — malware analysis report

Static analysis result for SHA-256 15df1b5237faf1d8…

MALICIOUS

PDF

85.7 KB Created: 2021-09-30 13:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 363a456c09e0d4c8dd08cc65f3275cfc SHA-1: 1076fc55a28d266701b10f1bf463fd42654b183d SHA-256: 15df1b5237faf1d8dc14d6005068227bedc816b7f1fc9e5284dcda3e0040843a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=bangla+notun+panu+golpo PDF link annotation
    • http://mygotour.com/FileData/ckfinder/files/20210919_B22BCC98A688C83B.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c9fdd460b---79450517794.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/mirepujogetojoze.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/pidomifuvugeludi.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/36386841081.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161544aecc15a4---50380538678.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/dipijuz.pdfIn PDF document text
    • http://unseretochter.ch/images/file/94047664484.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/68297585172.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/43152053576.pdfIn PDF document text
    • https://tierlistei.ch/downloads/48877829832.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/uvjbpc5034n885mvdafpe60mne/7792660056.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/tabawif.pdfIn PDF document text
    • https://sassanoproperties.com/FCKeditor/file/wubutabix.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/fetivat.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/0d00b5252d2067dc59b3a8fafb156fc6/paxegepedikotezaguxoxaf.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/82214296260.pdfIn PDF document text
    • http://fteq.ru/files/file/63633596196.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/rovevibexugetawujiluxako.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d3c942beabd69cbb387f0031dd647186/rujuzifojulagamit.pdfIn PDF document text
    • http://cmtsport.com/pliki/19541298357.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/30259891643.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/23393611978.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
font_00_sfnt_off0000c406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1D 10088 bytes
SHA-256: 5a2ec267457102879a7e3306b008bed3a0768ddd165616402857de281fcea5c1
font_02_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 23768 bytes
SHA-256: ea492dfe83256af7af2ea467e2760806bf35a65e54755557de082d25e261ac94
font_03_sfnt_off00012f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F95 16804 bytes
SHA-256: ad8d3de5df275ed6139e2f3a5eefe61b30a41145166c768f1abf960330584b15

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