Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c29f1c3f6608713…

MALICIOUS

PDF

85.5 KB Created: 2021-08-19 12:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d24dd7b839486677c6f758a2e70481a1 SHA-1: bedf028d4ab0ba95373a6c7080b64263d48b76a6 SHA-256: 3c29f1c3f66087135f711970813c8d31cd67556107f001afd9ea3834d13eb49a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with high-severity heuristics indicating it contains links to algorithmically-generated URLs hosted on compromised WordPress sites. These links are likely used to redirect users to malicious content or download further payloads. The PDF structure and the nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://xn--or3bi2da319p.com/upload/fckeditor/file/41205429146.pdf In PDF document text
    • http://cartopack.be/Images/file/84158438592.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/24590720526.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b606b551ff2---23146990827.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/mojbrg6rh3haotpql7f1el0afe/23039012149.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dd73e01dbd5---tumuxiwevurogapivimuzolen.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/40919183745.pdfIn PDF document text
    • http://fitviewer.de/files/file/14692436048.pdfIn PDF document text
    • http://faradbox.pl/files/file/luwawagodiweputejikagex.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/49835459469.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///46220416172.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/gerefiwuzexanidepadid.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/11sspei9a7hmto7dktcmu3j845/1118705055.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609dabc65d51c---80442158434.pdfIn PDF document text
    • http://sinostandards.net/upload/files/51713945997.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed07993685---30771583830.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608504d736bc9---wiwujuk.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f961dc98c91---38867008573.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/15338666777.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/73bb84034e8bd1545778c413784f0fbc/topisabezesojegexi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2be745d6---kepejelelezu.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a910b0d8a9e---84303997313.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/garowodesifaberigasog.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/6114062719.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ece609c02---58511935092.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/614160cf0e772260a8c16b798a8683e9/kejokuvarenufamelipimumu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+difference+between+accurate+and+precise+measurementPDF 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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 16676 bytes
SHA-256: a6f3c339543b64423728f51f1e49c3c7556286312a1e3308fe406c34c42c30cc
font_01_sfnt_off000114f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F7 11036 bytes
SHA-256: 23b875ff32ff717bf670bb00a98338246055cd0ddcea3fc9b96e4fa1d4c88f8d
font_02_sfnt_off00012e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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