Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d452def5e20f5b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-01 22:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1d9e86dd0fb613a6e9eccd846c96b0c SHA-1: 3f569a2460ef35d3d48967815897f580715907ca SHA-256: 74d452def5e20f5bd921ff6235d20694cd1fd55a1a84082a4c1365efb0834c48
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body is unreadable, but the heuristics strongly suggest a malicious link aggregation strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://aydin-elektrik.com/resimler/files/fudovef.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/o8tv16os53im0k607g5nr9ik5o/tituwofixajoloresali.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2e220cc9c7c5c56567eaba741649d389/rinomegawitaxif.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202108190004056727.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/47182671652.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/jgb88p4548r0abkstag8lo3fat/9128721489.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/75406992277.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6a7db919---94866964066.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd57b3b25d---93159141212.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/41453944244.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/b17fa5396972cfd3959e231bff59bbba/45643707314.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/0gmd2nsasqs62t6g6rm0udjuqf/xosisakudofebinovegok.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/gomedoguguse.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609acd0a0eb82---47154064594.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160abcfbc81763---jesefagadevemofeb.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce4518ef77---jomibipulevolubitefarado.pdfIn PDF document text
    • http://maility.pl_adresuserfiles/file/92972575122.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/lulazigakagagi.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/betogenajavuwojebasoviwod.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4c997a688---pufeziwubefoxeru.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/lejofufebuzuxavakipi.pdfIn PDF document text
    • http://erex.hu/upload/file/85213712289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=british+meaning+in+englishPDF 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_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 10488 bytes
SHA-256: 4c4ebee9cc2c14f1614386176890bbfd2e9b694f2566fa71f74af07809080293
font_01_sfnt_off0000f556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF556 23004 bytes
SHA-256: 9022bd14fa644b3c4d61f85bb637e95e7384f7b1e58feb549a0aa25f1cab5730
font_02_sfnt_off00013130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13130 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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