Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e84b7cddb716e7…

MALICIOUS

PDF

83.5 KB Created: 2021-07-07 10:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 04c76b7d978dc0a27ee1fbeab23b955d SHA-1: 77c88fd33fdd172ba090d2a0fd6ed880b4e091a9 SHA-256: d1e84b7cddb716e70715c29df13ec9c75ff292b6fddb7c2357a72291d1941c67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The embedded JavaScript likely facilitates the redirection to these malicious sites, aiming to deceive users into visiting them. The presence of multiple links on disposable or compromised hosting suggests an attempt to distribute malware or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 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://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bda94279e6a---ziwoluxituroluki.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0e0e419b154592464537d6ce850a1b21/65433416320.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f70ead049---mifesevowakoworu.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/kiwitegigegolopav.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/41559015369.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a46cf19e---vixudep.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/sojajogutanewizogumijeji.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/54026885704.pdfIn PDF document text
    • http://planbmedia.hufiles/jatufujo.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/15a3a9ccac7c4390c5549b92559b0ba9/guvukodarekigofef.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/1734280644.pdfIn PDF document text
    • https://ebooksweb.net/files/file/25656610343.pdfIn PDF document text
    • https://papiratisk.cz/soubory/1698031721.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0caf7a1e6170a6a809c959d56375628b/94286884846.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5df078e31---8702901165.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/koxed.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983123af86a---37102228936.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c82fb927f3---24024124236.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607044cd9cc07---87023323607.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d9dd5dc71---42420112261.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/77385704138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=facetime+on+an+androidPDF 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_off0000e65f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65F 10292 bytes
SHA-256: f3862a3c387462fc5696099d98398bdf866604a0e5c0d61382629e9f996ea60a
font_01_sfnt_off0000fd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7D 16820 bytes
SHA-256: 44816fca14fcf1380d661695be075ecf3b8033d5710f15e685d6c2f263f80fb3
font_02_sfnt_off00012929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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