Malicious PDF — malware analysis report

Static analysis result for SHA-256 7703aa4034d190b2…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 11:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 506c52772295d44a0cd7b1bf2cad0934 SHA-1: dee32fc969d2bea2b6afc495b59dfb9d51197a4e SHA-256: 7703aa4034d190b2c6d8ead4aa25b133cf2f7e71de7c83daaf4ed45a9c677640
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high ML score and ClamAV detection as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users to malicious content. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/f322f1159e1b5db1617a7649aff2e3fd/39400402546.pdf In PDF document text
    • https://paklya.su/design/img/upload/file/68843768438.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ccv8sfh8lij0ommkt5jqkirdji/6197727525.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/c8af6dcc87fb2ea93681d85a17cfe1e2/pabuvagovorixubuw.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/32567759798.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/67iiitin36rq9623pph3q9smj8/potujoninor.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/9420643605.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/1f05cd41d5d8faaece43ce05b51e2244/jateberamix.pdfIn PDF document text
    • http://spiregene.com/image/files/20210718_072717.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120db9328023---novunoru.pdfIn PDF document text
    • http://allasclub.com/campannas/file/pudixipugu.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/8d877badd334c17ea6ea0606d3f8a136/25977495838.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/c949647f8f14057bb3fd6706655b8452/52667686260.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210731_C15869EB8D34CC66.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a21e9c1d81e0fb63d34f1e1117affe68/dudavamepuwevad.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/bixufex.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/sojuguwekijewomiveka.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/47860879962.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/lofaziporutugan.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/3461286640.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2815a82bf---7309769807.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210728123704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=japanese+alphabet+and+numbersPDF 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_off0000d802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD802 21552 bytes
SHA-256: 4ade4bc98018317b6e856e1f8155de354563e587316180a403744548544b6f25
font_01_sfnt_off000110b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 10676 bytes
SHA-256: f5b07f806fe82c8df50171eb8d99895a6d16eb049b54e7bde8296391c39e274e

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