Malicious PDF — malware analysis report

Static analysis result for SHA-256 959f7b6709df4b10…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 09:26:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b2aaff9d89fca23b6889b53d49c88845 SHA-1: 22defbaef207bad2ac2181db2aa65bca9e16572c SHA-256: 959f7b6709df4b106066755160340fcd436472f335ca1240bbb95e334909be74
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ridendo.cz/files/file/13256626550.pdf In PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/9emojpp4b22ouc3eu4e2qst2dd/garatutifojoran.pdfIn PDF document text
    • http://drironcat.com/images/file/75815006401.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/59738367586.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/71792494077.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/30166242397.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/xiwinewawul.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40512749702.pdfIn PDF document text
    • https://academiapreprod.riportico.com/userfiles/files/dasivadisodaxiw.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f84d46f01---55992753106.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/24187992141.pdfIn PDF document text
    • https://synersys.fr/contenu/file/92827748249.pdfIn PDF document text
    • http://sun-eko.eu/files/file/bimiwiwevibi.pdfIn PDF document text
    • http://unseretochter.com/images/file/98560545967.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/mcaiblntgg5vfc6q6bfjoun3ql/nekosote.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/l5huv5sirilvfp0tbf5no6i1rb/pugezumasofaf.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/25915279638.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/11533163966.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16120a5f21e2a1---9221223223.pdfIn PDF document text
    • https://kamedia.vn/data/file/65059753035.pdfIn PDF document text
    • http://goldmustang.ru/files/files/95792033136.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/bokuxijumapugenonavebir.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/rukirolusurarebasepukipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=laurel+wreath+meaningPDF 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_off0000de66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE66 18320 bytes
SHA-256: bc3ec9c4a36e454116a996ff4eb55086e2d59408c0017922f290464b278448ba
font_01_sfnt_off00010d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D71 10408 bytes
SHA-256: 7ebc5b45e1e6815b7606d01d187887ddcefc2015e615652b95e5f256e292f532
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1