Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10841a1ff16daf4…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 15:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42749c9378c4c1456c0fddecb75d6d76 SHA-1: febb94c720bfcbb26d788b64870f92113ca82317 SHA-256: a10841a1ff16daf4b06f15cc63d4e4eabc62ae777b787295612595e4fdf40e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm or redirection scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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 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://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lufuwomijotadajuwun.pdf In PDF document text
    • http://www.tobywells.org/media/fckdir/file/zivojupapezazew.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/pugojixoju.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/sisakavuxeseluvotakezi.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d98ec3d66a5294aebaae1459a79f3edf/tavefokulexigiz.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/vilosesujerunep.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/79733537623.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/68137063833.pdfIn PDF document text
    • http://kelkenaghshband.com/app/webroot/img/files/kegojikeroliretegur.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/78971375984.pdfIn PDF document text
    • https://toocapen.com/files/36429354339.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/gazivekulunodelegupemeva.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210914_A2274198F7F7AAE6.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aec2884957---mazoribewugobagomuno.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/t63llhffq69c4kejkbrl22bmj4/punakeluwa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead77c92fc---71937820849.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/43189748376.pdfIn PDF document text
    • http://e-sportis.com/images/upload/bixixatubu.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/84419452314.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/98890673516.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/39929735900.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/28814293301.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mcmurry+organic+chemistry+9th+edition+solutions+pdfPDF 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 11444 bytes
SHA-256: f6b901732799463374f5108273bc38ca6db6b430672d2ad7dd4b8903d2dadaf4
font_01_sfnt_off0000f721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF721 16364 bytes
SHA-256: 2590f00096f2cc097fd2688eb2dda484216c7953fb719cc3d4786d12b8fda76f
font_02_sfnt_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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