Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb8a7f8e5eac040a…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 12:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d9468878d4c144854bdcfbbd088b616c SHA-1: 045c95d70b18f1227e3675486c231cc7b428663c SHA-256: fb8a7f8e5eac040a8fd7919575d7b9cffdc02d3d0d494c387eb83623b2093785
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO-based malicious distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://k-barrierfree.com/FileData/ckfinder/files/20210803_7BB01555EEE1496F.pdf In PDF document text
    • http://esistore.lu/userfiles/file/lejewubesawulodagusen.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5c7ebd9f8---90227130932.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/lolejitoxoridivafuvev.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/dozubufo.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/21633825639.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c975365dcff---wosabowufupovesewusizuxu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ed5607bab---noginexuzupinemenojak.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/speaokubcf9bg6ns7eb8uvr9ae/zavoditijogofese.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/12077631413.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160aa53d99d590---dudimikeguro.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/vodidonezipevepudowuz.pdfIn PDF document text
    • http://live-lessons.net/lcj/web/uploads/assets/file/93745953172.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12913626b---pewomere.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cad572e1420---supebikevunusaguduzekibuw.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6pv8bumqibak84akspqhc8gss3/sedevodif.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/palolobedetodirudera.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54afba9b1---86523824868.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/16772286455.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ecee45eac52fdd0a2bbe85a9abf600be/pubunuzofibikogozu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/4972942921.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/44148636944.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f052eac89a0---1137487451.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/19353155529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=theory+of+plates+and+shells+timoshenko+pdf+free+downloadPDF 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_off0000d762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD762 11020 bytes
SHA-256: 5d38ef304d772dc2acad6a354c94e24bf6a43c599fbc70fb950a3b2e0fb47204
font_01_sfnt_off0000f0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DE 17948 bytes
SHA-256: 7ab12628c67ed7a82462a5baeaea2676b3ba7c496a395282cd0d92fba779dcb0
font_02_sfnt_off00012008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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