Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d5cc98d83ee294…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b46ab6c928d3ecb7e9d4210dedbd9d52 SHA-1: e806fa6bde0935acdec44a514bb091aba95a856d SHA-256: d2d5cc98d83ee29476a2b10d29c7fe219e44425e45b145f372ecc30b39d463ad
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document acting as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://crysiq.ru/uplcv?utm_term=nitin+singhania+handwritten+notes+art+and+culture
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608059331df9c---nipadunulefefe.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/lejebup.pdf
    • http://ed-web.cz/userfilesfile/91006694287.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160736bd22fa53---98475096269.pdf
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/77704514363.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d7225fbb4---gifibesag.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/a97c86f342076fcb3a136ed2af1c0b3e/datepesajojivaj.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/ludowurawixanugepidemore.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609619f5465b7---lerexobipovatuzef.pdf
    • http://cokhibaosang.com/media/ftp/file/59822727574.pdf
    • http://akcjonariusz.com/UserFiles/file/jevuzosipobiwukuses.pdf
    • http://127.0.0.1/kardelenemlak/upload/files/zizofevunimo.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jqb8b78cplviqg1qvmi2r4ogq6/wojuxa.pdf
    • http://cn-daomeng.com/upload/userfiles/files/d7168d05ead9cf98289b9969c755f879.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6ffc77110d5e7d19dc0b91d3e9982858/36158028471.pdf
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/40651160486.pdf
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c91cbbd0e7---kexusoxan.pdf
    • https://soportedevida.mx/ckfinder/userfiles/files/54177192406.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/92152949324.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809a3dcff0c---xitonobef.pdf
    • https://al-farh-iq.com/upload/userfiles/file/3189314132.pdf
    • https://grafconsulting.pl/Upload/file/89179451448.pdf
    • http://palami.by/images/file/jufevasexupefe.pdf
    • http://hum-lucknow.org/test/fckeditor/file/30596416456.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c814.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 16792 bytes
font_01_sfnt_off0000e02b.bin
73620c5c8b1006e31c76961a0b9130590b4bd7e686045361db47886fe87fba8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 10812 bytes
font_02_sfnt_off0000f8e5.bin
1e10368b6f9349a1e8960eb3aaa5c89980d77731d4470c9ea406d7218a7b18cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 17864 bytes