Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafd3bc958e08c32…

MALICIOUS

PDF

82.9 KB Created: 2021-06-10 02:28:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f793b32af8a9b99186eab4d9e69ac54e SHA-1: f2cb24abc01bd4be76f86829854c53a69947dbb5 SHA-256: fafd3bc958e08c3251a9b60e9a31ee4c2495943da1dd9bd13945d60265c5b8e2
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded links and a visual download button, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm its malicious nature, with links pointing to compromised WordPress uploads and disposable hosting. The document body, though heavily obfuscated, contains keywords related to movie downloads, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://medvor.ru/uplcv?utm_term=njan+prakashan+full+movie+download+720p PDF link annotation
    • https://hasekei.jp/userfiles/file/figamafukinin.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/4246097353.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9e52a2c4386b33ef6053de9a7aa5b56a/26233736785.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf4f12a800---vumefufebeze.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/lufemuban.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a012893ace5---68203906649.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b3b92d1f4---11151495872.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160946974eea54---55765586095.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/10e6n00ogquv828osi769m7p87/29695300405.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cabd59c466---14481486788.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/fa360ecde3551e1225b766774fb7c389/18388050332.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/94642356294.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/76618285748.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/77a7a5c8cf7349fcfc6d2c80127201fa/nelexonotix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 5700 bytes
SHA-256: a9af558564476d7e873e728bd6048987086ab27f17c5c8950f5c6866e10ed175
font_01_sfnt_off00010bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDD 10696 bytes
SHA-256: 1c80caff46d1094cf7580e5ae66e2998fa7e7d3b277f21e476ddca312306b456
font_02_sfnt_off00013045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13045 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c