Malicious PDF — malware analysis report

Static analysis result for SHA-256 0abb4af0d2135e1f…

MALICIOUS

PDF

88.0 KB Created: 2021-06-27 23:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 695285431508454b2686fed086fd1949 SHA-1: 2e1cb2afd0ab3d809d70eddfb14a9d4e8a732f93 SHA-256: 0abb4af0d2135e1fa00283dfb9931c7431752e155196af151e53d474b091218c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded JavaScript and a link farm pointing to multiple compromised websites and disposable domains, likely intended to trick the user into downloading a secondary malicious file. The embedded JavaScript is likely responsible for initiating the download or redirecting the user to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=letters+ending+in+x PDF link annotation
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/7a7c40f167874ebf83af1ad5c9bc25c9/jeninejigevipebaje.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/mojeneratud.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/valazixobovu.pdfIn PDF document text
    • https://alutat.com/data/file/tabirobano.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/fenin.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcb4b214e1---54746905840.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c899f3a1d69---86659874229.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a656542cbc---67517058652.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/bffd9140c476e41e51537f30b4b36588/xawuzupudoveduzuxabu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/59305359303.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b32e668ebbc---58807923889.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/23698569247.pdfIn PDF document text
    • http://burningspearmarketplace.com/js/ckfinder/userfiles/files/82159225690.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/63b1170291aed2ab0be8e65ce9f76c1c/17532650104.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/waxupugorebawiz.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/livasexaxugufopexanu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ddd31d8---tojutenesosusopevazadus.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a4a0ef3b40d0178de7fe01dd832f019b/66809635306.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/dawevodalipa.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607850f5a3cdf---16384732731.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/doworakawu.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c853e7900e---gilerotufugituvemopola.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb992bd0f6e---fowedibovipujuteji.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_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 17304 bytes
SHA-256: c8fa851231d63e93c88cd400e1ad096713eaad82c5eec48c830180ae068d5d24
font_01_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 10156 bytes
SHA-256: 1913523dfdca613d50490928ba30d818f3dfed5e22eecde6deab9c6de9f26f56
font_02_sfnt_off00013acb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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