Malicious PDF — malware analysis report

Static analysis result for SHA-256 999b4526107756f3…

MALICIOUS

PDF

99.5 KB Created: 2021-09-10 22:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86641ce3d6fc8442d34934ad3b3d716e SHA-1: 91f72d7ef3acb55c6d5647df191f629d73d24355 SHA-256: 999b4526107756f308e7a6534e1478c167cd2c789f03cb8fcaca9d82fe4dbce8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various domains, some of which are identified as compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to download a password-protected archive, a common tactic to bypass gateway security. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/88301465645.pdf In PDF document text
    • http://jafra-com.at/userfiles/file/90438285686.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/wonibegoxitirawejoz.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/sogajijilelasifelupasofoj.pdfIn PDF document text
    • http://fnathservices.com/upload/file/timobulujizanotar.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323899116d1---pebajun.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bcc1ed21778fe9f673851f136eefe3c3/zomimev.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/49216513963.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630553769NzCc.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/56978171536.pdfIn PDF document text
    • http://ned.ru/uploads/files/4873747667.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/fires.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/18563866726.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/e71d41f789575e9c005103fb275777d2/34644252874.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/59945546744.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/43596539106.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/aejroo1edvgv6f4ldohveeuhvb/juxuxap.pdfIn PDF document text
    • https://ciela13.leaddeehub.com/userfiles/files/19879044532.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/46751991465.pdfIn PDF document text
    • http://packturf.fr/files/98028609103.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/35051157791.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/cjp3a6r9higgkjju4275n3numn/murafenunodotepo.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/96247827620.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210904232655.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ajpto12enn4l2aklpc49f35p8e/zokudur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=create+android+studio+pluginPDF 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_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 10700 bytes
SHA-256: 787d9be11683702d54c65e4ecb31ebdf3f504b4f3215207bd4229df14425af61
font_01_sfnt_off00013292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13292 20268 bytes
SHA-256: 6ade86082ffbfe493fcb442e152db91ad2a9dbd4cb253b068db316d072d1db1d
font_02_sfnt_off00016819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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