Malicious PDF — malware analysis report

Static analysis result for SHA-256 b442961ecbb4b47e…

MALICIOUS

PDF

90.2 KB Created: 2021-07-20 22:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 09c2ff7f1273135d349d6f4b14528c21 SHA-1: 5b3623d98eb40373b9e55e38d5f2cecb33becc01 SHA-256: b442961ecbb4b47efc386b876739240ff9671993d4e7331e581f99a4129bb883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised WordPress upload directories and disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://adasms.fr/userfiles/file/70184983849.pdf In PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdea033e852---rovojusukejevo.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/74556108093.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cd85df8697b---21302950670.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ae86fb97801b33aff8851cddf9808416/kuzegedazexoronazugeriloz.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210707171735.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c285222ce3---sasunodafuga.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/le2epa0h790fghgeijaao3nm88/wuwafivegisegomet.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/22012738176.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a483e8a542---gonifedafakuvilalikop.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/d315b77aa6b44ba6e3069db88d88b683/nerotebudixesupivafubidu.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/6350660397.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/49887321726.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/0ee2981a3c4d274c904db5af3e98fcff/lefapis.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/42222839446.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/bexikofulepab.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/saoasv1fbk5kim3hc3lik861gl/81566292789.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/vasuzogi.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/42792470519.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/tuwedadowilujekumow.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/bd9qfmnqlcsk65s5fe2p94n5ut/64341418483.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/07afeaec5c05445835d1457e0270ca92/80477848238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=delta+h+fusion+of+icePDF 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_off0000f958.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF958 18852 bytes
SHA-256: ddadadf7bba81e33cc0d93069526f34f06aabd57562e6b60120f06257a8cb663
font_01_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 10432 bytes
SHA-256: 0613f39dc21f0845db3682ce6afe596bd1cc3bf5c45777b1a2bb0145bd840161
font_02_sfnt_off00014395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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