Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba1aa0b48b7cf25d…

MALICIOUS

PDF

96.9 KB Created: 2021-09-08 00:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f4c00174a2fe59c5e4960d35a80dbf3 SHA-1: 69a1551cfd69c244514285b0439f246c30bb4c47 SHA-256: ba1aa0b48b7cf25dd8bf2a686cefbc7943f1de2e31f761dac4a3a8ad9ec935b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains numerous external links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of many URLs indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://allytemp.ru/uplcv?utm_term=chomsky+grammar+pdf PDF link annotation
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161281908dc03c---poweke.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/16877593113.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/62221628334.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/mdqe2g0ball3olt1jpodlbudjs/voniwiwej.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/pipisan.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/93407195323.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/duvupuzalivewojapob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930007f405b---37357745360.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/44e9dfd7c049e68036e75b96f02cf0b9/38011936437.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec33d92765---64196155178.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/tubokabuniwop.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/gh9m951vtfkd5g75iriu904596/18343996497.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a7a6beaa6---13744014036.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/85930094635.pdfIn PDF document text
    • http://sartor.ru/upload/files/73441628093.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/32507002651.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e91f36025ebfcf6d1f2680ce0f200f50/gesomekumutobisozi.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/46884789896.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/68488403293.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/40999227407.pdfIn PDF document text
    • http://amsaneeraus.fi/userfiles/files/50586753716.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/75900421705.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/24136935563.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/galedik.pdfIn PDF document text
    • https://angkalaris.com/contents//files/30388914360.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7b6e81e58---kurok.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_off00011381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B93 19556 bytes
SHA-256: 6fbd1386f0924593a6de3e5ac46d86cfb2bb83efdc9f8b21a054e7070c569a41
font_02_sfnt_off00015dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DFD 10708 bytes
SHA-256: c829e0071c12f100f98a416296e70482a542b76b75c6968a64379f20f7455df5