Malicious PDF — malware analysis report

Static analysis result for SHA-256 a519197e776cdbf6…

MALICIOUS

PDF

87.5 KB Created: 2021-07-20 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23f6fd19b55b1a668dccfe0a04f54acd SHA-1: 732749329f7e88d612df097252b025f3a9e28266 SHA-256: a519197e776cdbf6e4553297327f1f761f68b1940c5d394b99a0df746a028393
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample, but the structure and URL patterns are indicative of a malicious PDF.

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 http://expertsystemgroup.com/file_media/file_image/file/rutimobibojo.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/21d32e64f23bd292b31a449a650d87b1/85690680380.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a94f9691222---ridasopixosago.pdf
    • http://lateonsettay-sachs.org/userfiles/file/mifimukopedow.pdf
    • http://promador.pl/userfiles/file/dakorogejojewudiwokaxijem.pdf
    • http://phuwangnam.com/user_file/file/bumotekobuzutixififixe.pdf
    • http://melly-incendie.fr/img_db/zasevazisibigazin.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606eed7a89088---tuwofanis.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e95d606693---36457502505.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/70389ca589fa1055cf49eb0a59fee06c/nojakaj.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/piwexepuvuvu.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/d9525566f9f47ee5d99d66f07b5c371b/19849731763.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/de948906dd97c2cd2ccf03fc571a2e98/95224326726.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d75f7a24d95---ribusufoduribetiwuzal.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba353736ce---lerijuzimejujeponolox.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcb8228544---44398852110.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/78ef5f8f4077a1196ee0253ec84bd289/tesanituwupepubirenug.pdf
    • http://bitite.lv/media/txt/122/file/pujilefapuledofenum.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b62d642ad---mikeladevumolokomezo.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b97ef81d30---jeroxodedovapipu.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140719367a---70065601226.pdf
    • http://hoangle.vn/uploads/userfiles/file/87586471667.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/b65a5d23900cbad4cbd434a1603c0a79/rufumogedizarorurodomaw.pdf
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/wejolilakururile.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/a2ccb1eb37483f17d6e4a41dbda58e57/luduvikedukun.pdf
    • https://digicpictures.com/downloads/gizusewis.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=i+hope+things+are+going+well+on+your+end
    • 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_off0000f346.bin
44165133fe18d019632628a4ff7fd817b557a84ee88319211a2d570ab9acab4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16964 bytes
font_01_sfnt_off00011f4c.bin
60c1fe9be15dae1f88e5241a8254569eaf9e13959507868baf12f9f0e6156439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4C 10920 bytes
font_02_sfnt_off00013866.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 16792 bytes

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