Malicious PDF — malware analysis report

Static analysis result for SHA-256 073be7b2ba24c214…

MALICIOUS

PDF

88.7 KB Created: 2021-08-02 20:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fb83d309e5dddefc53d4483a5644be2f SHA-1: ba0b001b351dc14eec9cedd528b0db182905f3b9 SHA-256: 073be7b2ba24c214b9506b27afc78b68a35e8c67473c3f3bc0efa988883a0f08
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cakenepal.com/userfiles/file/buzovonokuxa.pdf In PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/org62i9qgajffjn7ildl7bl1v4/vasalufusarupodazinijeb.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdf11a0a4---44236488827.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/bh3ukevs1skt3dfkk1rgmstl8g/nimafuduvoterevasemeb.pdfIn PDF document text
    • http://belloverde.net/emailer/file/wawenamot.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///7568851879.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/46353199021.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607b039ba55f0---ligad.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/kuvasamadofiwagiziperev.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/51165382869.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/1f5b616da772bbde959b9b261ad21de6/jujut.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/gepikozusesekukadavikam.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaae9dd30f---30747835143.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/h5kebecohl98peietl3q436ljn/zogexurepeputovol.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/27074715787.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a418a8d164b---85806980332.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/zadaweded.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/40099875806.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/77247832211.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/65385967819.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d060e36b0be965817fcfe7e23e45a86d/48213890273.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430101604203608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=dangal+movie+download+360pPDF 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_off0000f6f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F7 17124 bytes
SHA-256: 80fd7a8fec94320bb955196f10b531daa5101938427309cdcee7d44ea6c4391d
font_01_sfnt_off000123d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D7 10984 bytes
SHA-256: 9bad577edf25fdc65a83bd615b35bc22e7c522ee70cd3e6015fe28c823057929
font_02_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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