Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddb2cd07c8cca37…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 11:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f47be846b6e742a54ef36cf3a0183157 SHA-1: d6053e5ddddbd53e34a7b6ee502422e0ea5c9f20 SHA-256: dddb2cd07c8cca37eb650917bdd5a993086d829d8129dd4248010362a3810ae2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/4e260f586a1e3fb8f0a360d9aa72e73e/86381490788.pdf In PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887acc32060---65946961810.pdfIn PDF document text
    • http://flirdining.com/uploads/files/zebubudizigawitisi.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/63588189310.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/34689251787.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/a8f6c8a7pd23a6o9i525e5cfc6/najavuluna.pdfIn PDF document text
    • http://southeastern61.com/clients/0/07/0748cf78e2268043913ae7c14e09e996/File/zowobololikegop.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/50609231677.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/27260554507.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8e1j34k4movmsb9l8ef3d4t34p/pabazivubimovolukoti.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121755ceb69e---pivajepenokuvajogi.pdfIn PDF document text
    • https://panama4d.com/contents//files/2221045511.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/b157c1d6df2815b436ea711fba8d0460/pewepupevapajufinoka.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/monujixewidulezesot.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/785m5tkg8h2790t4gik5aq1ok7/46171128006.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1dec4f7c437b197ddd593c552bc89cbc/25485108762.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/gekajetanimefunejobep.pdfIn PDF document text
    • http://sfalojistik.com/userfiles/file/pekomatenidif.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/72229199025.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607feea36e8b2---93929370033.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/mubeviruvetukolufedatad.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/buvekutesizuxuso.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/tewatobod.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/32844b67697b81cdb98fcdd9e353e329/16610015213.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16083a45c02c04---25667394646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ziegler+nichols+method+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_off0000c7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 10868 bytes
SHA-256: 9c508fd2d527954201d513e6d2450e971e28774c5cfa772a02356526b2b180d3
font_02_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 18000 bytes
SHA-256: 026536b08842deac2cddf3ff45461d108ee1d5527d2dca0c9301ef37288c20b5

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