Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f2996fe6b55d3ab…

MALICIOUS

PDF

118.9 KB Created: 2021-07-22 09:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b26ff7d1746eea4c7bb7c3f4d895a21 SHA-1: c0d2a2565856e35d609da1a433d17b5c9b2191b4 SHA-256: 8f2996fe6b55d3ab5eaf20a521a4b9d47f01d4e00e9596f332b1fc9d5da5ec0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, but the structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9859

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://teplospectr.ru/images/files/36190369932.pdf In PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16084f9d2589b4---78996483824.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/sezalatuk.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/wesagokuvovisivoraw.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608129dd7d682---riwotadisewu.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/32702877969.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/4407378560.pdfIn PDF document text
    • http://axwelindia.com/uploads/zimivebolako.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/94209777202.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c48099b1c---37346377280.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160d9d21060606---regirifov.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o4t4c9jhvrm54bb2cup47nme12/sakofulifiwegade.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d10b85ea8---zalutojunazaw.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb1cd5171---fejipe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86ea8d817---turunerogula.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/30191645094.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/3qi13tv0akacc3qt5uv66vdvfu/93431002270.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab145a4fa36---galogozu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/xeximigebizifedavesibomuk.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826f21862b2---32190116116.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/584f93370742a9ff81ab8b3fbceae16b/xajedokutibila.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/2ea68cfd1bf1af8d158a245e4ae37037/jekomujuximeponuwiniroji.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090341abb835---wevitada.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/mejotesalumixexiw.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092824d8c726---74300483656.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/232d64d36d9eb96c72eb4adb6cf71d1e/85535541174.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8629e25cf267f2f6bb6676dddfd47c0a/45042055667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=urinary+phosphate+calculi+dietPDF 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_off000169fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169FE 18872 bytes
SHA-256: 7d26eb9812f00148cff54ca5fec538f27f6c95f0193d915d4fab77c2c41a387f
font_01_sfnt_off00019b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B366 10832 bytes
SHA-256: 8db41bdb52cc2b02b9b9fc1cd37417dc86a4dd55f6033af2fde8d25582f9bcbb

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