Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0f863cd67e032d…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 06:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ef59a70544262137ff7bc0813db72e39 SHA-1: 8fd29e9fc9a31a823cd4414bab49f5cc1659c283 SHA-256: 3b0f863cd67e032dfa8934871fffd26a1508151965bde6d590e2124dc2e86941
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=heron+life+cycle PDF link annotation
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3166d235---2906924358.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/82978936067.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/banamodijisagejopobo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/0vdmn6g4m04a517nahq9jo9n0q/mekafo.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/69068736265.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/gogenewamasukenobiw.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/71983737212.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/6612850518.pdfIn PDF document text
    • http://sdds.be/userfiles/file/76836722583.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/sutozixameruxivimenise.pdfIn PDF document text
    • http://hkalc.com/userfiles/16847251994.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/aa52d443e0d2b6f76a2db9735013ad74/kukeli.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/lutilevemibusifis.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/xegubokolurisupuwesekiziz.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/gojawitodikuxafasu.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/zukejitefusazi.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/rikagesamode.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/zubosiwapiwifujefovavum.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/modobiponid.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/91538439464.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/77686193697.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/20330879963.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/18619546420.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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 10008 bytes
SHA-256: 1c8af679cf22e74f6ce12197321b5cf702e31f33ffee29b315f595690a3465b1
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 17288 bytes
SHA-256: 52bd0d56e6e64bee6460abe7151680a1129d3aee60ee121c02d495420da3feed
font_02_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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