Malicious PDF — malware analysis report

Static analysis result for SHA-256 90589bee804ecc3d…

MALICIOUS

PDF

98.5 KB Created: 2021-06-29 21:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f892c8cb1726efc7c1cd18126e324577 SHA-1: 0056ace68238eb6e6beb410694ed3455362bb48c SHA-256: 90589bee804ecc3d566c5928d37540cc24097bec953132a5cef91f59c6c8fa7e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites acting as hosting for other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The document body is heavily obfuscated and does not provide direct clues, but the link farm structure and compromised hosting are strong indicators of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f7e819922---22566948020.pdf In PDF document text
    • http://fujavietnam.com/images/Download/dovukofizedavisidipofo.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/29e6f5e411cddef79a1337a2c8e91679/wijoniwuge.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/tejibu.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071be0a59805---rowujiwina.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/bc97e4dc266d4699ccf8922972f6a7d3/rivoluwanon.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/somiwanimuzeduvufetil.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5db4da6a64---13290557403.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/85728604777.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/ba7bdda2dde3c5878899e85fb38439cc/74481432070.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4d4659d0---buwozekixabuno.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/35v0un5vejne59ss53u2rdpef3/26406569782.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2710420073.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/nowojixe.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4441313db---xilisotukafupubosi.pdfIn PDF document text
    • https://telenovella-bg.com/files/48615979844.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086639711279---zeveg.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6782f3050---44695545329.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ks8l8jbnrl0q0igfc3ri5msfgn/20601404639.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/c033a3f3c71cee62b41ca941d19982ba/pafat.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/tazimirur.pdfIn PDF document text
    • http://c-six.it/userfiles/files/wegipimosolofoved.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/1ts0cmgo7tjk2lclmlcpucq6jv/46428355248.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a142a26f5d9---8882031566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bulldog+tom+and+jerryPDF 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_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 10728 bytes
SHA-256: 8dcc4138d6e3c32f13d9ee09be7981716cd32627e9ad37237ad8c9edf3f6fde4
font_01_sfnt_off00013167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13167 20320 bytes
SHA-256: aa46358ce49c26b6e59031037d93657bc95857c416f8ddc115f7e4c71a9aa3d3
font_02_sfnt_off00016515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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