Malicious PDF — malware analysis report

Static analysis result for SHA-256 4740f435f5588268…

MALICIOUS

PDF

90.4 KB Created: 2021-07-08 06:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7d579c2bdf99b9acf33672e9dc9a9503 SHA-1: f98e5c95c87d9beb83a01376b909e77ac506d115 SHA-256: 4740f435f5588268441367b6ddd92313aa89c9c47916992bbed9e6783bef54b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=gazetteer+of+india+vol+2+history+and+culture+pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jljn451v3aqpatmp6lmoe5d4k6/71788230006.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/ounq6k1e6i60ptsrr52bo25ms2/xajavezotesabugepitixid.pdf
    • https://divinenine.net/userfiles/file/91806980554.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079494c61491---72876967403.pdf
    • https://stillwaiting.org/userfiles/file/nakukutesosexamixusawav.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f023f06512---30846348046.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6cbeqhtksc517ge7n52rp452o3/fumorufibudelewonope.pdf
    • http://emailreceptionist.net/userfiles/file/73946708021.pdf
    • https://fidelishospice.com/ckfinder/userfiles/files/65381022816.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ff3a3312e717f2e5de6419f87ad3727c/72075750569.pdf
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/afe8118f89b69b22850121f950033e47/xokesevibe.pdf
    • http://iehyun.com/editorupload/file/39809914842.pdf
    • http://adamslakeband.org/userfiles/file/dekerararejobemewemon.pdf
    • http://bidwoodmachine.com/d/files/nakig.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d484233724cb9445113e88edeaa8f778/binupimefabomufisi.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/e7dc1d0b0e5cdf1d4eade0683770f247/golifenusedufexitiludani.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/misutufetodujiden.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/kozutukomub.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/dldfk7inj627fian43ho6rf8jp/towavotaxinufeloz.pdf
    • http://remont-elektro.eu/archiv/file/wabired.pdf
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/fi071psha8pq2u9m4c6gf1q9kl/wutesafer.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/853d6366b9200ba2da68300588ef1754/15158774332.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94944abd97---feseketuraza.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce27e6c4ff---42426495260.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0f62ce70---voselepixapikebuxuzake.pdf
    • 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_off0000fe1d.bin
1d427119b4762035c179eb33c8e43b4017fa425e8e526e764a16c29526c79722
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1D 16688 bytes
font_01_sfnt_off00012962.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 16792 bytes
font_02_sfnt_off00014179.bin
5906bcf3b58e4a3199634dfaf8db81f67342bfcd33cc832a51dbbff16605d18d
pdf-font-stream PDF embedded font (sfnt) at offset 0x14179 11216 bytes