Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7c7e3fd901b32d…

MALICIOUS

PDF

93.4 KB Created: 2021-08-21 04:30:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1fc7aeef0a4667f3b9b8ecb91ecd4c92 SHA-1: 15defdb5b54cd0dd0daadadbad8ff6699d4f69d0 SHA-256: 7b7c7e3fd901b32d4c31637a09d71295e3338c883fe3c7a6746a3f9e8bd53740
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ClamAV and ML classifiers. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=bajirao+mastani+full+movie+in+hindi+free+download+hd PDF link annotation
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/3aoqdr88h9n875flqpto7dek47/xeburavejiro.pdfIn PDF document text
    • https://goldenapp.net/file/nosopisamuvawifivux.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/12801905702.pdfIn PDF document text
    • http://sns.hu/_user/file/zivimijek.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098aa596f0e0---kujoxewakeketoloxi.pdfIn PDF document text
    • http://ridendo.cz/files/file/11082550198.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/mebibeko.pdfIn PDF document text
    • https://noddy.nu/images/file/72807317640.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c39c74e0bb---2774046345.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/pizofeji.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210723224902.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd4321c0e8---33734280198.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/leferuf.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78906147e---72238395275.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f655067f---liwaxamujosuxofeduraso.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/fotanamo.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/53008194544.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f230662dcd---xisafuxotobizasa.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/54019356735.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16119473a57248---piwugijuritexurasijidetu.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/53772216711.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/difugodebose.pdfIn PDF document text
    • https://subded.org/userfiles/file/6528239221.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_off000107db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 11056 bytes
SHA-256: 61def49210e6e2d9f6f68579d833f2fbbcf81127b3df4b36d8aab5fee6088ace
font_02_sfnt_off00013982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13982 17440 bytes
SHA-256: b9e24941735c33614b2ca6e643d1e4b9e368ac356dc5163f406fe31f2c4e1f27

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