Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9246cf475f049b…

MALICIOUS

PDF

101.6 KB Created: 2021-06-26 02:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a169ab42a955ddbe7ff01bc543b0f22b SHA-1: 5ed9cbfb8a5516dcc5ae60467b2128c805b89d9a SHA-256: 5b9246cf475f049b332e003b639d9f8244e6bd4e4c384050cea75dd8a357ed87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple compromised websites, many of which are WordPress installations hosting PDF files. This suggests an attempt to lure users to malicious content, likely for phishing or further malware delivery. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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 http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a577b912e21bda432223ac2cf998a184/tegexokajurizixirimozi.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/q4opje617bqj2l1oc2obo5cenu/jeganajufeligezuxo.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/13503d1c6d004df08e570b058b03a762/55248162057.pdf
    • http://3gr-group.com/ci/userfiles/files/67997095799.pdf
    • http://tpokebar.com/uploads/files/fizulofur.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc065b4454d---sumaruvowofaxegudibizu.pdf
    • http://avanti-kuhni.ru/upload/files/28259352702.pdf
    • http://www.lnk-creation.fr/upload/file/13171394629.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a1d2bcc02---fitabasuvegu.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9620fa63e7---goluru.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/713bffc2a4bfc27c97c72432b533b804/polalobudezajezoz.pdf
    • https://zionapostolicministries.org/uploads/files/57297930854.pdf
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/28216a488a6886997e249fc70743220c/zoputaga.pdf
    • http://zpb-maciejewski.pl/upload/fck/file/67503942863.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f306e84552---tejinibubunifa.pdf
    • https://villatoscana-pi.it/userfiles/file/32010590595.pdf
    • http://jtour.vn/userfiles/file/dixepamasizuwu.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a53e7ba1---72599144984.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/ba869cf69bf1d66627f0c876b527595c/96313360490.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cf7592bc041574246a430e5789b92abd/90939132513.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/ff27fb568b47595a4ee044da641b0f7e/31247610396.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=7+deadly+sins+manga+last+chapter
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/4b45badc8dc351c6efb39e3570c7a8b2/78360863343.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_off000127a2.bin
eab56e62ab083c410ff73e01734cdcfd9983c98b8017915fbc6c36f0ee7ed10f
pdf-font-stream PDF embedded font (sfnt) at offset 0x127A2 18412 bytes
font_01_sfnt_off0001583a.bin
4521f89deede37663989ea972cc6d7f1f527c5810bba59d592c38ce778c16340
pdf-font-stream PDF embedded font (sfnt) at offset 0x1583A 10908 bytes
font_02_sfnt_off00017111.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17111 16792 bytes