Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b606eecee4e982d…

MALICIOUS

PDF

100.6 KB Created: 2021-06-29 08:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7d758d284eeb638346a02adb6e6380ba SHA-1: 9a530ce9194d35e56351f4b0229d6194753edcaa SHA-256: 7b606eecee4e982d980d8fee865808b544ee6ba284d992fce5f6fe50c8184bf4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malware or phish for credentials. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://cphs1970.net/clients/877309/File/bivoxepovulusatakevume.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/8674e990c0aab017fd813ff2b26f4285/34754551519.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab23f0de203---pogenofobezuzafebi.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc235af716---77857163686.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/xupukixewojapotozo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/05d0715bce57766aa29621bbe826b284/83242811200.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609def5f602ab---parul.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/911e51a287f8c07eeb80e40dd3fe6f27/98462852504.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd16c63fbf---16671695825.pdfIn PDF document text
    • https://hostingyuvasi.com/calisma2/files/uploads/nuvalinusovokilabub.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7b904608---vikofovinunowukum.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093c013a3afa---34807410540.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/11c48430efa5dae6bb8eeed404638299/80877115935.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/28759977077.pdfIn PDF document text
    • http://lulanjina.net/upload/files/gojetuwavibifupiji.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5r0nd9rduce1uo7q5u6la0ab86/4637194380.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/vonudowajavewiwuxij.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/fae9753238cbc366ffa9b199e805e824/jepaninidi.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b73b64b14d3---goxosixin.pdfIn PDF document text
    • http://novichiha.ru/pic/file/rozuzufuperifetika.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/54768950560.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fe8f7f710---82314234193.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/8070172879.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/f9652a7ef7228f3518f79d81ce6e6eed/14576521466.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094832d0df3c---21745448838.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085b6354ae1c---samozobokukezigemewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=physics+for+engineers+and+scientists+10th+editionPDF 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_off0001263b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1263B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 10996 bytes
SHA-256: e3d3e68ffe63bb01c610fcc05fc04dfe8cdc0a94a42a980fde9e5549c944e2cf
font_02_sfnt_off000157b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B6 17272 bytes
SHA-256: 8334976e788b727119adba014278b34a973080499dc5cc04a64b87df223d9682

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