Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ab01c3004dacda…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 01:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5521ad09f142ed361ed712dc889840c8 SHA-1: a9f3fde9045dfa3488821a1d43271de80cb51f70 SHA-256: b1ab01c3004dacda41959175d7a9815546356300c233710296e93db593f29891
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these compromised sites, which are part of a link farm designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=find+the+area+of+the+shaded+region+parallelogram PDF link annotation
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82c3396229---niwejutawonopowitizisez.pdfIn PDF document text
    • http://sunarfactory.com/userfiles/files/79887637575.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/396cd98367da27a2cabc25c1a1030bad/66590059443.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4aff8441d3ae062f8df497ed7c8534af/fewoluma.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/28496803131.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/jovifebu.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/komemixopidetuzafumuj.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/781ab10f5361974925eb59dce7c8637f/57596103725.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/pudilepa.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/75485246393.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16097befad01fb---xosotolazufavogoda.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e244dd4fd---pusetajerewidasela.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d928c9bf23---kenosugeroxikoxepuwipiret.pdfIn PDF document text
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/8767924638.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a2943732c---vupojov.pdfIn PDF document text
    • https://maturana.cl/upload/file/88207621777.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/64e51f021071b2b1836392d2a8d24bbd/27127324999.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875f7f180b3---48718733099.pdfIn PDF document text
    • http://acril.ru/ufiles/files/bejijojogonarer.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa58092aea---16227060076.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/17567042804.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8c9aa72df---ruvelujijokow.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/76754675875.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_off0000eacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E1 17560 bytes
SHA-256: 4da848de9361aede03a4f581b246d53014112c4b61b0a65525df036a9e400449
font_02_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 10924 bytes
SHA-256: 43a74023fb8fd232c96887ca38fae058b604cd43014d136de0c115ff000588bf

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