Malicious PDF — malware analysis report

Static analysis result for SHA-256 85db4fcc1ef3ca7e…

MALICIOUS

PDF

92.1 KB Created: 2021-08-20 02:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3a7cd54da360d6b7cd17bcb3b5a273c SHA-1: 1a9125946c2b550024bc9aadeb776812199c286e SHA-256: 85db4fcc1ef3ca7e14c176adbf8bc40c06de96ff5c228a9611a43602b1bbbf3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, likely serving as a lure for users to download further malicious content. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://albino-pitti.com/pub_img/file/nipiwirimuruxuz.pdf In PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607358f5419f2---65308725143.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fbac4ceee33---wozabujukivoduvowani.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f5502824bbcc6ff56bb2af91b3b639c9/sugewowedutamitidatoveda.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/10389639211.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/22925749370.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e2ee1290---sijisetaperut.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210616060919.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/69269477981.pdfIn PDF document text
    • http://xnkvinatimex.com/uploads/files/53217904431.pdfIn PDF document text
    • https://global-brand.net/userfiles/files/fibow.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/1c5d27302bdc1d99b1140475968a6365/8593146744.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160987c3ec1697---zemaviwutodegawerate.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160928e457309c---lijadituvaxofuxagoxe.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/jefaxuzur.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd4d018db---62286983658.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/nubodanujo.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/dojugetefegosonofi.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/dufojugabisagejimuzu.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/40585029392.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/loxuvedofowoxidoka.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/30323200088.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071bed7368e3---72809637852.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/34505146291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pokemon+flora+sky+rebirth+gba+download+zipPDF 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_off0000fc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC53 19844 bytes
SHA-256: 64df2a602d9a781c6d5222a2b8dbdc6fe8510287b81a36dc260f711b129fb6c6
font_01_sfnt_off00012e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001469e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469E 11436 bytes
SHA-256: 0272f45641e5686487271aeae910b997d5eb50064562a52e4195978c9a6dbfb5