Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ef7a5ee35a9dd9…

MALICIOUS

PDF

80.8 KB Created: 2021-10-06 03:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9f15b4711c091e8e76a2fd2aa16258b9 SHA-1: 06c461d8c2b518a9c153c9326dd24f3b4b14375c SHA-256: 33ef7a5ee35a9dd935ac2e80a378c43fc97f260c6dec6d9eadb765433ec885b1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=what+does+it+mean+to+be+apprehensive PDF link annotation
    • http://www.companyforte.com/imagenes/editor/file/52230335771.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/wulipenigufosot.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac80357606---20035548540.pdfIn PDF document text
    • https://unaizahic.com/Files/files/6428964578.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/46577757798.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e1eeec0674dc9f6e3cd5df82b2aa7ecc/28023024644.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210920_020804.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/kagalujafeboge.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/13450425728.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/lagirujewisalirojenabubox.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/gavosajafub.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/puwilibagigoxesiwenukige.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/21131651724.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/zonujatesipo.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16132925e82875---kejerimogukuvaxarapero.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0fc47ce4a---kunusar.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/b15ca7923b74b243ca2757b5ffd7af87/51640124042.pdfIn PDF document text
    • http://elpijisystem.com/file/jinapusago.pdfIn PDF document text
    • https://unaizahic.com/Files/files/85195436640.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/92698484840.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/vined.pdfIn PDF document text
    • https://carlojans.com/cms/file/foxugesamatuxejeponuvedo.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/87862996654.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_off0000d7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 10808 bytes
SHA-256: f1b3aae99f21a55b54bd6989482c6eef9f59881e2ff5e6aa58dff6909f95781f
font_02_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 17648 bytes
SHA-256: 5ec86e3b240712b0f6c291e02a6bc8fcf8209210a85da6b352fcb7cc35842369

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