Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80476a6d00453f0…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 04:19:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 284fe139bbd54977c1e2def4a73bd524 SHA-1: c8c6366752c5330dbfba573f036a288210e62146 SHA-256: c80476a6d00453f004e2239c726ab8d184c6a3a5053941b7484295d9fce4d23f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms pointing to potentially compromised or disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=android+go+install+old+phone PDF link annotation
    • https://www.corpeverest.com/ckfinder/userfiles/files/sojozobokotidexikikudiz.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/werup.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/11097090214.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109040446242026.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/biselu.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/20717200464.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/74108564051.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/83923951098.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/bpco09adti52pj6c382eumacr5/23054408248.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/dogaloxoxifigovupiruxit.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/zibito.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0i2jehuf4i5qhi4301a7s0rk4/29571213577.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/20606363271.pdfIn PDF document text
    • https://harmony-lazienka.pl/Upload/file/foxoxunogobizavi.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/fujorijinixuk.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/tasivefomobukezaf.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/17983380768.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16145115056646---fudifobus.pdfIn PDF document text
    • http://ghefoot.com/fckeditor_userfiles/file/zigikodijazutetigomase.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/90645818996.pdfIn PDF document text
    • https://aedwea.com/upload/foto/favozuxozi.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/60050014586.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/4336691602.pdfIn PDF document text
    • 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_off0000cf40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF40 10652 bytes
SHA-256: abc7d46bc1d918f7d12f8a3b9a8241dcde41f0b89ff240deb55b61709dcd5089
font_01_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 18176 bytes
SHA-256: f6a9aa58ac183b723eed4597b1d28f17bb36f991f15e9896871a91a60cd19ad9

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