Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad11606622697098…

MALICIOUS

PDF

78.8 KB Created: 2021-09-04 02:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 43d4c5a7630065462aeb6f79447a8c1c SHA-1: f4947f2e19e6e1e708e4f871eae416fb1c8efd66 SHA-256: ad116066226970989f59cc25586330bc96178f4edc4309422d0af76e44526242
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and potentially malicious files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gemwares.com/userfiles/file/95098612592.pdf In PDF document text
    • http://maplewoodmachine.com/clients/1/17/17f0ea2532424b9b8bf99baf53cd3763/File/42672229480.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/0ce756b19c124998257202c1f4e35c84/75652205710.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nkf27r9lv67qqiu2aig07k4avk/36890064883.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe1180f29---kujopadokaburitabebuj.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/84687638570.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9977d9330---tilibas.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/53666686555.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/wojalosufurapifomu.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e65d81eb07---24900129096.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/56184272066.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/39128983275.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/15928947116.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/98320678900.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/96770720169.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/baninosotetaromezuvam.pdfIn PDF document text
    • http://abnicum.ru/files/file/totojug.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ffbd9e5cf---jiripevilorefedoleweli.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/eb82ea1fb82c8b184006ece6ed556c42/49499079008.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8d08c935---bezabexoguvoluje.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/wasepifasemaxilig.pdfIn PDF document text
    • https://morabia.fi/images/file/rozeselisugenede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=convective+heat+and+mass+transfer+william+kays+pdfPDF 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_off0000cd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD55 17464 bytes
SHA-256: e80a9a8bbe63a285e41650ec40ec3560209b0f060bb4ceb8add30008f26ae486
font_01_sfnt_off0000fae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 11276 bytes
SHA-256: f31534cab0c6d1c0f2351e096cbe4ac1de0dab865476b392ca5d4afe9ed3b2e6

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