Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0b633993c561deb…

MALICIOUS

PDF

82.1 KB Created: 2021-07-18 10:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1d38574d9e455b7e6dd4e7e06796ea55 SHA-1: a02fc247e1c9f6fa0218160ad9f2c4a6b12bc43f SHA-256: a0b633993c561deb3d04937c6f68f0cad17ec58b3688960e2e67c9259aab6993
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 distinct hosts, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. No scripts were extracted, but the structure and URL targets are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://broadmoor79.com/clients/864886/File/7153422954.pdf In PDF document text
    • https://toskov-yordanov.com/userfiles/file/93790589610.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/ralejepa.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/fa7a55fac7b3b6cdc6375fd902ffa0c8/27439714057.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/sasdub1lold5lc2f8afc73jk5m/73869471889.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e904780a7e8---88635823997.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/edva9njm648dkiod8pjanbsa8v/88089652915.pdfIn PDF document text
    • https://service-panev.com/userfiles/94150122941.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/46204699498.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/13652441776.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/nadeximixakano.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e652ddd5eb0fff0d89f21904f4750f32/nipasutegemufajesedobunu.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c039de55e0acd16ca1b2f27c721fd5bb/97877083441.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/110143507320.pdfIn PDF document text
    • http://jestbogiem.pl/app/webroot/uploads/file/kidunawipirugu.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/57682706457.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8939bff1b---82520145456.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/6e646f272e06c3f4a8975ed9ac9b3e06/mepew.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/t6cnapsp1nuedp3nujqi61qp24/ruwigik.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/082d1669965f20f32d015a10a22d874d/jiwezexeku.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/70e826b697c973630efe8b8194d34039/35382796055.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cpprkmcot4sngmmfg5ndalf0k1/75142006822.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f7781fef84ac49a4be0f3f8269c18d6a/32932476722.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a0f20fd7541e2daa045d6a4e15faebc/40736720629.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160996072817a5---31635915148.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160705ba1f11ca---18724971004.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/28572102483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+books+free+download+in+tamilPDF 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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 10836 bytes
SHA-256: 98d2bfbdfe89b6f2019b7dc7b4b9eef37574ad1c2debd9d33f1a2ba02ca4ebd5
font_01_sfnt_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA4 17356 bytes
SHA-256: 788aca966c8df59297ecafbf3823d8be389ff52dd70e7ae722a1b6971b140b9e