Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b21774c83eb145b…

MALICIOUS

PDF

95.9 KB Created: 2021-08-17 21:52:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 727f813c475b7d59d37cc539d053cbd0 SHA-1: e02b279aa1afa5266675a2524dd6d7673acefec2 SHA-256: 5b21774c83eb145b97335db29483325a7e50d5ff1870be5c52192c1dffd62528
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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://irlanc.ru/uplcv?utm_term=holes+book+report+settings PDF link annotation
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/lkbu1pegb7lm3a6110jpcl3kc0/numekovagomozivolitedi.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/64249250489.pdfIn PDF document text
    • http://elite-weekend.com/clients/9/94/945a7f92a07ecc721aac768ad340748a/File/75023937943.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608195b702252---kimosutatifimojodizuzewov.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609476d71260a---41355054283.pdfIn PDF document text
    • https://advertisementnepal.com/ckfinder/userfiles/files/53834896987.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/gebotufizizitureb.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/95317935342.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/11669088823.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/da112569f8849ba20159012755092324/duxexubofunasevedefog.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/lozakoxemevigutovog.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/86324817469.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/8901cedd3f24447977b8655148da30a9/sabuludafuxu.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29bb5bf50---fopadewolurisojiniteti.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a354f203b9---jawogesajajuv.pdfIn PDF document text
    • https://educhina.mn/editor/files/zakuzitepesozanawu.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/d1437d30a4584b7b78fa8c0fad04831f/taxuvotivirupenakaselonan.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/45877594754.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d6eb4db7---10025317691.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/47102347582.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/45159055222.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/kiropekukajomapurexizurit.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d87cf068---zaraluded.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0739958b6dee555363dccd049508926/xipemamipajovoxel.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aee2077670bf32b50ad5077592b8040d/64188526051.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/vuxuvozufiwukem.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBD 10488 bytes
SHA-256: d1fe70479bb9f151c4e81bc8a071b55d5074c5298f6fabef9f13820453aa112e
font_02_sfnt_off0001466c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466C 16880 bytes
SHA-256: 525732f2471b1b00fcbf36a1b27dbaf7cd3cd014c84f8791d69bbe3e2c8891e8

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