Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc731befb4b1d06…

MALICIOUS

PDF

101.7 KB Created: 2021-07-30 00:33:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 903c3206b87c97c714c4c94df11154b0 SHA-1: 75f3f736950a862a61b13789e6ed0dc9e245a8cd SHA-256: dfc731befb4b1d06366387c30a4629680b4f65ffaefbfc2df9e796a22a544c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to obscure the true malicious intent by distributing links across many disposable domains. The presence of external URIs and link farms strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://chcial.ru/uplcv?utm_term=mitos+griegos+vicens+vives+descargar+gratis PDF link annotation
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9043d69a---8140440061.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/bunakifowuror.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/20574883866.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210505202058732316833.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/1328684529.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/85826987950.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6bbc9e835---vedirozirutid.pdfIn PDF document text
    • http://chayka-svg.ru/files/88154021613.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/denirapuxitibewofamu.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/83497839039.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db44405c95---busug.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30674d998c---34499112383.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbd1c292d---75599117649.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/34318922275.pdfIn PDF document text
    • http://terminsk.by/pics/files/92049622638.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/33456094220.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/38963530671.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160bf87c4737d2---gisedaj.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/72546460340.pdfIn PDF document text
    • http://dzbnf.com/upload/file///bopatupijotukitosa.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a34c55732---pavesaselomixoxerazatig.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/71120254529.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/aav1s2628vdol880cmp82dinmu/38349749605.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/nabulubakasasifoti.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 10556 bytes
SHA-256: 1ec0e7c78461a4b2f79a76ad647553ff082d5365f69c784717832d17f6afd988
font_01_sfnt_off00012348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12348 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_02_sfnt_off0001393c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001514e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1514E 20164 bytes
SHA-256: e2beca6b70f104adf5e5cddaed0e39e14c2e4826157cb001572445a3d79c9e03

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