Malicious PDF — malware analysis report

Static analysis result for SHA-256 539c6aa607999745…

MALICIOUS

PDF

97.7 KB Created: 2021-08-31 16:24:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 40ffa905180510f1588409388c1fde54 SHA-1: b683c14de115611460413a1e43388a613c60603f SHA-256: 539c6aa60799974516631357e11bf24df2ddbe7a08d08dceced0a64ec2e4c2a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised websites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://ropesadventure.com/d/files/79266123292.pdf In PDF document text
    • https://thaiwoodengames.com/files/upload/files/letosopugisematedig.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/kipuwubabemeta.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/fexanisotiforaxukizasof.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/81691194863.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/xowijepi.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/43ee6b021ebd764da1b00d5e4d0e9a59/30644439931.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160bb21e43b9a6---88095703470.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/pirolakotego.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df4d8a64f0---bizuzuzakibipuda.pdfIn PDF document text
    • http://www.heksan.com.pl/file/53494012187.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f0c2a926d---98203088531.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/faguledove.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/fugozodavirekuse.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/lefawodosopusivemiperipon.pdfIn PDF document text
    • https://onwater.my/uploads/file/95637889469.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/fb314c2dd017ca75bd47b985827f05f2/99455510602.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8781ea11---kowajusarolojapofo.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081be52e6c2f---dukedekegu.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115d7331bc52---vepudikofimaxama.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/30719942829.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb160ca2d9---zurezuzipazosutiraba.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/95350630635.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fijl39ns20153o6713adv7ukan/49505075517.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/87a6318b8968fbdaab7ff90fc12808d3/30071964603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+you+wear+a+dirt+bike+helmet+on+a+motorcyclePDF 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_off00011a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001321f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321F 17432 bytes
SHA-256: 22c09da258fba5bdc7e9ec8afef4465dfceabe6475d50a071a9e8108d5dec1c2
font_02_sfnt_off00015f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F70 11032 bytes
SHA-256: 868efb57936937131fde2f0ba999ceeb0d811ec2c8fc4c0753da3b57518d2303

Open this report in the interactive analyzer, or submit your own file for analysis.