Malicious PDF — malware analysis report

Static analysis result for SHA-256 99803d43e63dd08c…

MALICIOUS

PDF

84.1 KB Created: 2021-06-26 09:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e675f5590446afa8e7c9a7b3045dd164 SHA-1: 6c75a3cfaa6710132ff368b01e14343655749f7e SHA-256: 99803d43e63dd08c89263b94073c694d66ddcfaafb82d39fdeed4d3460645f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://datawire.gr/files/files/lukaxesiliz.pdf
    • http://box8websites.com/ckfinder/userfiles/files/kivaxukakebexezikijunot.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/cbfee906ea3b81efb542cc5ac6a6b74d/20866277718.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074814c92a55---jemavuxeliji.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/6380e57050f879d7a937db3da13d1055/84083354299.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/36v7li0valumad9c2i7g1ua2vo/gojuwafabunilupukegaw.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/1838aa4601cf99b00026500c6a9dc033/fizowof.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da7fa0dd3---87355514344.pdf
    • http://kistours.hu/userfiles/file/xopagukatigef.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16087d62325455---32893188088.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dc65814e1---xezazuwifipiliwed.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/msa6tstrb6s4jf7gish04i1du5/fidepazaninavifewibi.pdf
    • http://circolosilverblufitnessclub.eu/userfiles/files/gekonituforozapunodovazu.pdf
    • https://thechoose.it/file/99981019811.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb547843c---39455727339.pdf
    • http://aarogyamedico.com/userfiles/file/63770766736.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff5bcafcbe---jugokoxebabiboxobud.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff7b7511d---79504301821.pdf
    • http://graficaeformazione.it/userfiles/file/70123350481.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06b663fb51---75339397301.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8a5124e691f2f85fcef386e061e6e098/33001905880.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4586113ca---2106229914.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/66iaoa1tsehaorv4c51vni9jn7/dexazi.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1ac9abb6211e282e50ef4f449866ad22/gaguwezewaxerik.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/64b9c440bbfde0b279bff4a9379d4845/47363494434.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=factoring+polynomial+functions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e567.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE567 16792 bytes
font_01_sfnt_off0000fd79.bin
85e01ca0916aaa6492bfa82819e16a7dfce77257b1aadc2f6aec86280568f20b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 17020 bytes
font_02_sfnt_off000129ed.bin
599e55de046ad7909cf17cf64e118d4c3499d311c36e1c01522aa1a5fa1f5f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 10884 bytes