Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3c39efb9fe91c7…

MALICIOUS

PDF

103.5 KB Created: 2021-07-24 11:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 490240ed68f98137ef8a0753384ad7d5 SHA-1: 1d684e92b177e20793745ae98826f5b2dcd95a5f SHA-256: 4d3c39efb9fe91c7d897551616be570d085835b891f02a95d374a5d827b25319
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://kcde.kr/userfiles/file/11600395366.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607829a2d6f77---58534333608.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/87530219887.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/65578613961.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/93ff49f1abfe46fe8c11787a2f32076d/33062869694.pdfIn PDF document text
    • http://xsteelstock.com/d/files/rovilo.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210720171528_dHVkaWtldmVmaXJpdGU=.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1d53749256481afca152ceef53403cee/gosuxefogamelikogavune.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210723_A8DE727A8D6B91A4.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/43245111365.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c55dcc5701a---73961931307.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d41cd3f6---fugupufe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f64ea5132---lapojebi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8246ade71c---lidojagediragotaduzo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947d7be52a3---musupimevure.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/r3omee0n4mpoj5kvb4padrh2ef/zabafeg.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33092acbc---44928201424.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uqv8sogkg05qf8ia74fpndotk1/20771200873.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/92481395171.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jalima.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/zifomowefuk.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/7455e0215ce8591c68c69fb503a1271a/gegaxili.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/38398886550.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/30jo29tccfc157pkkmu3ut7gi4/gujadowarana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=wings+of+fire+book+pdf+online+freePDF link annotation
    • 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_off0001327d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1327D 10640 bytes
SHA-256: d2efbd4443c6f1533c7d68aeec21f9f5c2d0c53bea201d5184c5efaf6c1ff2ac
font_01_sfnt_off00014a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001628e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1628E 17128 bytes
SHA-256: 0d33531168552f46c8d30fce140dee686ae5760302f19f2342b11383701c5f92

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