Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abd8205eff49165…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 08:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f46f1a5019ea3f34960be89d4ead8ce SHA-1: 9d121a38425cb97dc1b15ccda9002a61a949ef31 SHA-256: 8abd8205eff491657a8e2576ffa49c6e428355b59ea6ceba81fc36ee6c207479
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/aefe79884f2944c0eb487ab20ee00121/82411866084.pdf
    • https://nangluongvada.com/uploads/files/gazipevufusowasurufof.pdf
    • http://doverhighschoolhalloffame.com/clients/2/2d/2d76883e1086210ef8e2c43836b0327f/File/sareposetel.pdf
    • http://ahcxdq.com/uploads/file/071429098444.pdf
    • http://m2m2design.com/userfiles/lisaxe.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ddfda6d7---xejumexiwivumowi.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767f506ac10---40455778219.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160790531c590a---67525853158.pdf
    • http://booklandbooks.com/userfiles/file/37172378506.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/70297854361.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/79edef32b326ef0b840ace9abd231152/zijujofexakesoromudulum.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/zufat.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086793c75b54---paser.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f45f53103d---88243130489.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/75626695176.pdf
    • http://cuacuontoanthang.com/media/file/85557442863.pdf
    • http://soyaksiesta3.com/userfiles/file/ketakan.pdf
    • https://aronabritcan.com/userfiles/file/wezewetiwisidepunejowux.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/f9190074a2426288014f104c0e2495bd/93577134042.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/638b28166bf2dafa840baa5d6e72d4f7/sureza.pdf
    • http://physio-praxismitte.de/userfiles/88262291741.pdf
    • http://braghieriarchitettura.com/userfiles/files/21222624405.pdf
    • https://luatkhangthai.vn/upload/fck/file/vawolitenagapudibofawezix.pdf
    • http://tanabuauto.com/js/upload/files/wotubo.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/63cf8f40180284c19d263a0d82da906c/18295397554.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/5o0q51sbhivqbpf0kdjs6cu63u/7583755317.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=moore+clinically+oriented+anatomy+pdf+free
    • 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_off0000da14.bin
1ccc9149982f524014b5431eeb24b44055b2c3050fc6ee0cdf928acdb79c0d98
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA14 10720 bytes
font_01_sfnt_off0000f2ae.bin
b304f3420ccdad1eecd49a1f664e0847ee97bc9ad754d8095ebc41fbeaf5607e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 18360 bytes
font_02_sfnt_off0001213a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1213A 16792 bytes