Malicious PDF — malware analysis report

Static analysis result for SHA-256 78da6077842f0124…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 16:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 95c57ff4c6228ca419553ef2a7b4ce7c SHA-1: ac2967f26acb3ce25f15c1ad70b28ceb5a65667a SHA-256: 78da6077842f0124b66fadab20d520c233cab4593e35a36b0299924b148c1135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URI links and the overall detection profile strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://superpart.com/files/lagifenusixe.pdf In PDF document text
    • https://quangcaowebsite.vn/uploads/files/nepegeneviju.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/8ejb5k1b150ecik5hjj9u0p296/24563196523.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/denarip.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/11547559783.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ba76280b5---37611714709.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3dce376a42c1c02ea731d8f07c72e354/38960140420.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358ac91df84---89803115665.pdfIn PDF document text
    • http://24cvety.ru/upload/files/71912921058.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/bufopijobu.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/68352444712.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/86696085914.pdfIn PDF document text
    • http://szermgrt.hu/uploads/ckfinder/userfiles/files/wozowixeginorajuxojutasid.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/292aaca69b002da590fc1859a5865fc7/nazoxodabesamubibisorise.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/21756967688.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/161365833e8fa6---gesesal.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/lepupisudejusoxer.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/74817989735.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/japademoka.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/8184416482.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138922be3b07---12716879217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+ubuntu+usbPDF 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_off0000d43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC51 10124 bytes
SHA-256: e17815765ce9158a4e71612ba44609886c8753b68da82efcb9e0ec4e63f37392
font_02_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 20760 bytes
SHA-256: 60a9ee4b3a2bf7d693c34defe9b03c608cfc970929c36d931424ff73e3b81263

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