Malicious PDF — malware analysis report

Static analysis result for SHA-256 172dc3a20c094e86…

MALICIOUS

PDF

89.2 KB Created: 2021-06-26 03:18:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a5ebd2818532d24b94cc74be344b39d9 SHA-1: 5c09a69a3860089c83edd565462cba5ac47de0cf SHA-256: 172dc3a20c094e86d9834d81bb66101d3ccec2901577fef025124d27a1d6e490
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=in+cold+blood+2005 PDF link annotation
    • http://braciszewska-klimek.pl/fck_files/file/67576951320.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/5ffb76615ce2d7797db6d17cc7b58dcb/tuwekop.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/496c31579dd374b5ba0d8adcb0fe46a8/79912387170.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98288e8cd---develibuwiranegojumim.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/5bdf97ceebf79d75f773a03ef116c81d/53738286478.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/csdut6ja9jlept6n0vecktq4ji/87672846096.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bf1k1jvep7akb75apg1p8dd64f/gametunasu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8svcceft9oarkec9d7hmplvrj5/jaxatewobexufudevatotek.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609278bc800d0---53145878117.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/pofoki.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/69060416018.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/donipowasimobotedize.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3d6e1bd91c603f9288d7b5c9300c1052/wulisurofovovawekegefo.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080419b28491---27588906014.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/25350249688.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/53a0f0e2da70ef2217c2d6fcd7dc0076/95345791872.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607196a1ed1c8---ximikiles.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/pokide.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c811d156ba---wekavofulekeponajebu.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/xabeze.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/r38lbntom3t5ub3smrfc2ci7gt/32264056612.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/34054993958.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607775daa7569---bupusuwo.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_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 16844 bytes
SHA-256: 989aff58f503111145a0c37c72e14b8c046f23fc83d69196fe3a76a968496c88
font_01_sfnt_off000127d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D9 10080 bytes
SHA-256: 3c4e1b8e3b6b5aca08933164660e7ab6c08c22b1a71f59b3483f4c2d34f81a17
font_02_sfnt_off00013e5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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