Malicious PDF — malware analysis report

Static analysis result for SHA-256 68221b5ab1ef5a8d…

MALICIOUS

PDF

87.0 KB Created: 2021-07-01 14:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0b692625e1941fe18da9f94797b4453 SHA-1: c68da7824119c4af6d7952c4622f25944dd02b47 SHA-256: 68221b5ab1ef5a8dba4ae70f103826d14529aa46f18d1a06c0b4e0132f823d06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but likely serving as a container for these malicious links.

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://suprizpin.com/calisma2/files/uploads/zigaxodudelugimadano.pdf In PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/6aef8c34ae7103dadf1b7719ff37b06e/50058940751.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/savixowazilobubanilapakaf.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/vevpokljli2tqrekn61rqr4deb/2756522151.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16097c6d1b747e---mixoxapotuvozabet.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/51170826272.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/c53d2bc2eaa9310845cb7ca81ea4e820/losalawodukedilobozuzifix.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/54788537344.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7be63b331b---pifuvebi.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160782a71098d8---6237616708.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210515184757_xib3gr.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/saxuzijulo.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097397c4951b---dowasujadaxapiposetuga.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/0dd575de95a2bfa5e8a7f1aec0f6c064/nolodejogiwuxulen.pdfIn PDF document text
    • https://at-studio.tw/app/webroot/userfiles/files/20210630_091846.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc43c89fae---totikuvadoxekesup.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/db178ce53f619bce453b767aed14da2e/ratumatewo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/22u8j9oasqcqrb38ha4hsuuum4/lafazepilonorubis.pdfIn PDF document text
    • http://brunsfamilyreunion.org/clients/e/e7/e70b0594429ddd28dfd4dd2f61c76e80/File/rugewojejagasogukepixo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/r9v9out5aeguutg7nd225l6q75/fuvobo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/78ea39f053e45657f94010c09720dfb3/67527951102.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/tavimanuxuves.pdfIn PDF document text
    • https://go2germany.ru/files/file/82290275384.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/fewojuxodalifiwowosoxaze.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/39666621295.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/movolesudasidikodej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+pick+out+good+watermelonPDF 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_off0000edf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001060b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060B 10956 bytes
SHA-256: 410e2e1cf01a3f7acaf1bd1e99bb046fd98f9c34ff18b1b6c5e20376d240aef8
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 18132 bytes
SHA-256: 010458d84d465f3ba3839c9d97abd434cf6ef4fa5a684c6c0854f41f7ce46c0f

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