Malicious PDF — malware analysis report

Static analysis result for SHA-256 777de0ce146f0973…

MALICIOUS

PDF

80.2 KB Created: 2021-09-07 12:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 03a755eed111afe630ae80d81ee52215 SHA-1: 37106c56f5dfdb814a655bf288d89d9564dfc4ee SHA-256: 777de0ce146f097329ccce2b4a033784283936d643af022c324c983252ec5ee4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URL 'https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=postpartum+preeclampsia+treatment+pdf' appears to be part of a redirection chain, further obscuring the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://leguido.net/files/25019136166.pdf In PDF document text
    • https://ienter.bg/files/30969510668.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/81987137732.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6321a9716---mokog.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610736a367a22---numijijatoruneduzewu.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/pewusalupuk.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/nurerotimuxakowifow.pdfIn PDF document text
    • https://il-gusto.com/images/file/13434826205.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0196eaec4---wukuwonasumozikuze.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/70487277574.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609054b6247f6---83585289243.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/161171a515a2b9---zomerex.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/72134a10622ed2756a8a619e6394ee02/voxibosiriz.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/85278109805.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794163e8837---65602870968.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/61617458538.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff7740f4d9---suzeranuriwadotewazak.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/53087119587.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fe6cf06cbbe127e0cb3e8f399f7ad78d/doxewitowidozi.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa9ea8170---48840564312.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/favuzebeven.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/xofogarivafuwakoke.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/95584850618.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608efeb927f5c---72366318670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=postpartum+preeclampsia+treatment+pdfPDF link annotation
    • 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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 10884 bytes
SHA-256: 17210b180e9abff9f467f75849e5b63bcba34b126f0c043bb332ae3d47e0c895
font_01_sfnt_off0000eea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA8 17012 bytes
SHA-256: 8a0aa0dda0ba4f7a5c5bcd68b25cbed59d6fdec22f15e7722cb908382166aaa6
font_02_sfnt_off00011ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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