Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47bead5aa528221…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 23:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f5b02162326c9be914e51f8148313753 SHA-1: ba5704f9b97a62a826447b4d4b2033be6693a352 SHA-256: b47bead5aa5282218f52475992f66ebfb7b8c9587b3f008d36ff8127c780c411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs extracted from the document point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs further supports a phishing or deceptive content delivery motive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://oaklandscreche.ie/userfiles/files/nobikef.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613941ed6a363---gowinekodibiwidizarab.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/zefatavemi.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/6defc601100f780e6dcfb091c4823eca/xubawa.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tozitanezifet.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fa2115938---renupodemidigow.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/lusegezowari.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/bagudakekikunegobu.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee02e2272d---pibanumiwogejulenuvowi.pdfIn PDF document text
    • http://sbkf.org/files/files/97032511586.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/vulizukipazogirepu.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/72018228.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/gawulevefeke.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/42862751214.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/59700395695.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210913170156_xoibyh.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/tewajemurapomixizorijeriv.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/jaxadajazefosimavasus.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426f0a079c1---32707137143.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/86615520206.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e895bf0da885e56cf7bde9422f6d3380/lijoz.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/pixisam.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/temimumodulid.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/14763499283.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/pesazunafunuvovinufevufog.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/78756489226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=real+cricket+old+version+downloadPDF 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_off0000d732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD732 10652 bytes
SHA-256: 4554654cae5e1cb6575dbfae3250acd63154021ab20a97171ffbcecf9929e1c0
font_01_sfnt_off0000efc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D8 17564 bytes
SHA-256: 546a8b6c9ac27ddf4b0842c5996d428017835baa8465b109d95e1c66b1a300e4