Malicious PDF — malware analysis report

Static analysis result for SHA-256 232ca8cb3798b5db…

MALICIOUS

PDF

88.0 KB Created: 2021-06-30 19:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2161c8d86fd5745039dccb0e1495be70 SHA-1: af1024fb6bd7c18d8533013f528cb75c8644dec6 SHA-256: 232ca8cb3798b5db31b56ea53cd1123a4b756087512da62a9992c95c339696bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e2ee82d1---fenovuz.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb68462182---jewuti.pdf
    • http://www.deco-interieure.com/userfiles/file/rexazexaxesiz.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a9df3b68d7f---20977897033.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2d61824c0---wubafu.pdf
    • http://ned.ru/uploads/files/felenu.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c789ec706ca92cf8fa49b274ecc97df3/33299189242.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/73a1535a3db73fd7f975e39ff8d0d727/tolanujevufoxoxusijike.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866276757cf---powiwoxelulutuvagiripujo.pdf
    • http://nuitsdartistes.eu/images/file/67997290015.pdf
    • http://zabradli-znerezu.cz/userfiles/file/53307443789.pdf
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/38182683760.pdf
    • http://acril.ru/ufiles/files/rarizapovap.pdf
    • https://tecnibat.net/uploads/archivos/94972147697.pdf
    • http://kartywspomnien.pl/uploads/assets/file/xuxevunadivoduluwa.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad955a81d39---puzakunafugapa.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a58dc530505---1069549845.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b89b26feb---sogof.pdf
    • https://acgroupenterprise.com/userfiles/file/xevagifutopiruxujuwev.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da34e60ea8---70278230503.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/8kpg20ukoogctnbbvn6d57hpti/xugawelalatuv.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094603f1ab09---63456733334.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd916531e1---7691580065.pdf
    • https://proektasis.gr/admin/spaw2/uploads/files/laxiwejodupuvexomu.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/a1b739802c70d598e2c2980ed61cdf97/50375542725.pdf
    • http://sistersaviopublicschool.com/userfiles/file/30154753408.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=comprehension+passage+exercise
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E9 16792 bytes
font_01_sfnt_off00010c00.bin
58dc7d91cae3227aa60966439779b0c0a47b7c2c74e4d6ac789d9d591fe86cb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C00 10812 bytes
font_02_sfnt_off000124c2.bin
2bb8c5e0ccbe4294574126c09d7283ffe44110d315f47582bd4934f02c544012
pdf-font-stream PDF embedded font (sfnt) at offset 0x124C2 17152 bytes