Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d08f6772c5d261…

MALICIOUS

PDF

99.1 KB Created: 2021-09-07 10:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 133cd02cd1a7a6ff37cd952a0079b822 SHA-1: 23eba22de58efe48c8686de35a30065f685f46a5 SHA-256: 77d08f6772c5d261c3f6fb0b6c36f202c097cbe1b642333965c415de5e0d3b70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the presence of external URI heuristics and the nature of the embedded URLs suggest the document is designed to redirect users to malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://huntic.ru/uplcv?utm_term=albinism+facts+pdf PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084ad5dc4c33---76714230292.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/lqe13c4mdh7219rmi2c3ktrfk2/84224421175.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/4093875389.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/afkc9fv70gthdrucv85vc5478e/zajakigefaxefereluporot.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/47707876852.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fuluxejemorez.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/00c7b75e7df37bcb799528aa0264b83e/93018458118.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129cdc68dce1---jilipotumesesonebumex.pdfIn PDF document text
    • https://belhasasecurity.com/userfiles/file/weseguwapene.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/0f5e7d9a1e204ca5ec8960a44390cfb8/tijimurisagojevaxeraz.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/62460575543.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/79921480446.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/gezupazopavexufufad.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/470b8e1f679d5b465c125c51d0285459/pamize.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/67119764013.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/56tqnik39tp6fajbcr7ej631ba/vegijuwiwam.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/88994612434.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c880d6a25a3---malotarogukifidit.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d4c41e2d754c9b1fdd1104f7a10c428/basiro.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/26527587624.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/68917838231.pdfIn PDF document text
    • http://kurdumovldpr.ru/uploads/files/635940821.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/noraxalubavuzipef.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021080712101273499.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/90962885245.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_off00011c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C61 19500 bytes
SHA-256: d74076bfbb83c014e3cdfe943ca9674d3c17e2c741abd6bcaefb60701f8ca647
font_01_sfnt_off00014ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ED3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166EA 10548 bytes
SHA-256: 532267f98eb30e972076f1159c24897183a8336bcf7d234819b892931b357f87

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