Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ba57014c541ab1f…

MALICIOUS

PDF

85.8 KB Created: 2021-07-19 01:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 02b64154669dfa86c0f33cbc75001997 SHA-1: 656d289de0c781bf98f63ad4f15ec959efdbd643 SHA-256: 9ba57014c541ab1f844ca4f95f6a8468a881eb88f5771ee2f00d8838132ce2d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, rather than user-facing text.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43d4340ae---vatogapirobiwilosimenepi.pdf In PDF document text
    • http://baraanduliaptti.org/userfiles/file/74421557211.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6iamgpuo5idq6hv4eb76q1fm2/pekerimosigiwak.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/62247467756.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/nejilirusomutaxidefupu.pdfIn PDF document text
    • http://heizler.hu/files/file/87326596110.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/jojixo.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/40457787802.pdfIn PDF document text
    • https://businesslife.com/content/file/wowigisebuduvali.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/vosize.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c903b343838---napudexafupotir.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd00befd---pagisufa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70915dfe0---39218558421.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/8513234241.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160edb857c520e---bebumafilivatak.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/57331355416.pdfIn PDF document text
    • http://chipgene.com/image/files/20210702_200654.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210623_145628.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/52484649761.pdfIn PDF document text
    • http://senn60reunion.com/clients/876260/File/77861232945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+indicator+for+1+minute+chartPDF link annotation
    • 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_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 10900 bytes
SHA-256: d77ead746ad0bd08a11b7f18c2045a8647be49b29cd4921c99e9895c946c617d
font_01_sfnt_off0001015f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015F 18220 bytes
SHA-256: 07886e995b9e41ba37bfea4fefe84fd15e91c020e1b34a2ffd03341510ad1b01
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1