Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac11399be865731…

MALICIOUS

PDF

98.8 KB Created: 2021-08-07 14:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbb8f335d2bb4a18eea142b93692364a SHA-1: 823ca1f77afdb6c6298df08c2921bd4892766e2e SHA-256: 9ac11399be865731d945b67b2a6ce055dec1bf9192d94e448b2433ae65ab0c53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it functions as a link farm to redirect users to potentially malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=catherine+hall+civilising+subjects+pdf PDF link annotation
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861c221fdaa---maradaxofologazega.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/57371272823.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/pinososoxofifugudonar.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/sagafijotewinilopalap.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/57846478422.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/bagobigadad.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160889196f058f---wixizofofoduvorelikig.pdfIn PDF document text
    • http://ozari-ua.com/files/file/41612753763.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/81780bc8d702e4af9493aaceb1b43c2e/67484737726.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee59cf952ef---69451747570.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/61591993623.pdfIn PDF document text
    • https://beaszemin.com/files/1914746174.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8ac4735ebb7cf748f308dd2e253a6af9/revejog.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a179756b---75163412652.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/7c1bbfa9e95bb61ae6d205729c8e46f4/9499019829.pdfIn PDF document text
    • http://www.olivier-frey.ch/user/web/file/jepotivudanejuru.pdfIn PDF document text
    • http://metallpress.info/files/99581294207.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/d0a29f202327d907a6bc5788e48db44a/92828939371.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/66896199736.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8dde11a6e7a7d25a3cb39aaeaa1f5e35/80351528881.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/4nbodh20mt5j4lpc0cs13g1vse/29052550033.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/jidedavadakarowixekus.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8091a80935b2fb0163734e695414c505/20216448556.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_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13957 11244 bytes
SHA-256: bb367cbff1002154b927495e63f59cf0b90a8cb3502b402f1043431379ce09d2
font_02_sfnt_off00015336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15336 16360 bytes
SHA-256: 8dd0582a8a2cf2a6d099c4eb1f62376240fd416937e243c4d3ed305aa5fe1f90

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