Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cb30324aaa163e…

MALICIOUS

PDF

131.8 KB Created: 2021-07-02 09:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9884775510771fb3902fb84181a5b1a4 SHA-1: 90f95393af627c16def8c878e66c1b99f7b70f66 SHA-256: e1cb30324aaa163e2d3100eb2a433193348427f9342893e1178da73c1da4ad53
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://poolpoint.be/uploads/file/25525209681.pdf
    • http://creptiles.dk/userfiles/file/76797689000.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081362342c8a---zumeludaniduvax.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c93dc7d65---gesari.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/26665699067.pdf
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/77562264061.pdf
    • https://marblobathware.ph/app/webroot/img/files/nimowepojifalave.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/nejumanifatet.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/00280ade1eb4519363c79fd3d503de7a/88720970371.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/uvpasftth27668bac6nekgnp09/zafiju.pdf
    • https://banderlogclub.ru/Files/file/39839837868.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a22c7c5c561---kirobaxusudajuwawidofor.pdf
    • http://allamericannursing.com/userfiles/file/98881386467.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/hgrn037h3l86pm8rvf00bm29km/gawidirutegivolediduw.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8464c58d64---sulisoluxivawegesabo.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608324723d043---15404796653.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77c25849d5---govunizajuzifozujupo.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab96b9ce317---wijisijewijavigekuvek.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16094bbaac2922---73161925986.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/a1qr1e9c9kbkm02dmdj1ogv8q2/53443094916.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/mogipewuwodeturewa.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160d66c97cbb71---49986301150.pdf
    • http://praguetransfer.com/files/file/46851625396.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/bda6d37e76cb99ede5914263ececb430/24332413909.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=physiology+of+digestion+pdf
    • 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_off00019fb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19FB7 16792 bytes
font_01_sfnt_off0001b7ce.bin
bbe6750f525dea4f9c2425c2486f11b6a534053ad95c172a127c123ee3b5731a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7CE 10632 bytes
font_02_sfnt_off0001cfda.bin
21e8c9153ea88b90010380af9a181942bd6e5b8c4c38c878d934b7b11c5ff138
pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFDA 18844 bytes