Malicious PDF — malware analysis report

Static analysis result for SHA-256 9943cb2ca725460d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-07 18:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef3c66bcc4c18bbc44737fd2b077e5e2 SHA-1: 9014da15a5a045a6cf5944a8bac980e627cb278b SHA-256: 9943cb2ca725460d1002a7a18fbaf56b6b4110d66b786c6861ebd7dc3a907c5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lead users to phishing sites or download further malware. The document body is heavily obfuscated and appears to be junk data, not user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=advanced+condensed+matter+physics+book+pdf PDF link annotation
    • https://0286869143.com/editor_images/files/20981030596.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/zetifejekixozigarijipi.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/66283271676.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7kv9k1ch12t5sjkun5a7qh6da6/26864691565.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/2afaltibenbtc3ajl2tna2kflf/budaxaz.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210622_185747.pdfIn PDF document text
    • https://vieclambanhang247.com/upload/files/8642360919.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/zebadigimami.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/114529258960e11dbacc33d.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fddd88a2---dekokorabazurexoxixi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/251747e0de008b302a23817c380b0271/80704208168.pdfIn PDF document text
    • http://precisao.net/files/files/24030896144.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/51040333745.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8753388eb---84454883087.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16238514050972.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607069a6cd14a---95468142341.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160976ad5b58d5---gufanunejesixexakune.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/ccce711c63c7cc0b00be292ae84077d1/kinikabejavot.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612521bf6dbe7---33973906253.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1611c16da288e8---xojaxa.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3841c42a3---dupatub.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/04d6b3a41cdf4e860a3dbdfe2e2c896e/gegajofupopudafexaxikiv.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e877d9de139870acb905e5b17b1ad6fc/82776297938.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/38618283763.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/jezurotebiveruzarakilode.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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 18436 bytes
SHA-256: 9199411bf9143d6d755e1682aa8e93086d4a8beccd01c51d7e2569d1098153e2
font_01_sfnt_off00010a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001229c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229C 11232 bytes
SHA-256: a5201d4f60f38e31cce537812933c71b250d139b45bfc6e4e277e1c8bd4d3720

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