Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79c44e882b8db0a…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 08:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2c37a6d16988ba140e410d002aa04dec SHA-1: 050249059355c808046adefabc5c7986c2146e50 SHA-256: b79c44e882b8db0a852eae936562d1880f9de8f917f240b7cffe693c1bf69304
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, likely serving as a distribution point for further malicious content. The presence of these links suggests an attempt to lure users to malicious sites, aligning with a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/8c619c6f368a05b703fa09c312e75aa3/55738419689.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/582d8486ffd7f229f119d9802b491f24/64842128294.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b39c61042c4---19645692742.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca87a9587f---23716751541.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c202f0eeadf---liwamekulamina.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/38b815cd52f09e6aa764138c0222ba8f/42021806078.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9cc1d8b4---14087294151.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/81918ce72e260e8797650dab3c3dc83b/76481459971.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfec70aa82.pdfIn PDF document text
    • http://dnepropress.net/files/file/55053982050.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/kanotefadozomomaso.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/70222521760.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/859d9d2bbbd49a1fc587483a68abe346/vikat.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f6a4fe3f202f0839f7543cf87d9c1ede/59050672228.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/2197163897.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/i4f80ajgr9jriuf56l2jr3c03m/618485462.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858486dfce8---11635095016.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9aa998a10054d5b1a92eb07ce3ef6b93/48873838583.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/67341ba8ae37501111e03d542a3c87ed/gonadupalisuvakakelapub.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a91ca5c9aa202b2a494dce6489f33819/loxotesizew.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/ihcu2fhr77m1bncicnf0895pum/1773415239.pdfIn PDF document text
    • http://www.toptehnik.si/images/wukenogabizaf.pdfIn PDF document text
    • https://rinducm1.com/contents//files/mizemubajuxi.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/c0a531d70377bb07282a31cb8181a271/2241440748.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0816e1e0a770d765f72387198f43b063/jebobabuzi.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/f7d8bd721f434d1764d967e06ab49874/1802940532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+do+i+need+to+get+into+grad+schoolPDF 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_off0000f86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86C 10644 bytes
SHA-256: dfefdd0a7f32f4d7be2a207c6e337b7178f0476bb962c63f6749917069647d92
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 16972 bytes
SHA-256: 74a56a4080a9aaf58237d7a6989616f834dd9bc3ad4cd6101be667ba39bc914a