Malicious PDF — malware analysis report

Static analysis result for SHA-256 6409db6386e3aa73…

MALICIOUS

PDF

144.4 KB Created: 2021-07-08 02:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7319ac2122ac55bbe4ca7912c3f2293b SHA-1: 028d80d5c04bb36ff1a9fe948472c607057e7d63 SHA-256: 6409db6386e3aa737a2e619a054fe3e3ce815f001762c3b8cd5ab1caa4986157
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, including WordPress upload directories. The presence of external URIs and link farms suggests an attempt to distribute phishing content or further malware payloads. No scripts were extracted from this sample, but the overall structure and URL targets point to a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://ketchas.ru/uplcv?utm_term=aphthous+ulcer+hard+palate PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/p5hoccrbb9pdp1fsumdnas9rvg/35608438656.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e59369abfbb---giparakujunowuzora.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/05250015d19780a0a54013e23b1318a1/64214196180.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/63641496732.pdfIn PDF document text
    • http://babamoleskine.com/files/file/7541641301.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/towodamurixasaj.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/hsam14loskth7uqa2jgmoq8dat/74769303805.pdfIn PDF document text
    • https://m3csrl.com/file/88236779526.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/76a7851de58c3e7c791bd8660f3d7b3e/11738464260.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/52066744015.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e457da984c729c16c4a327418a9981ee/vilop.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2df237110---nidazigowito.pdfIn PDF document text
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/a9bb6e92a7b1d390b8b23c23fa7d2ba8/96552041796.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/f400234db15f5a75b9ffb1eb24680083/rotixuniniwomozen.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210604163455.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/koluvitanogunometirepubu.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/78260229040.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/dakomomemikaxonosobevo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec53966681---75751756390.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6fde7d3b6---bagiwobinidux.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/77287710919.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/zalixirapim.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D496 18280 bytes
SHA-256: 7451952964ab6ea7bd9ee3568dd31d46f29053067f2e06336c7c4bf07c7c83aa
font_01_sfnt_off000203e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x203E0 10496 bytes
SHA-256: 67e4464687129cc9e63fc20f0927a1d0ec1c93cf65060629c89ee2876237aab9
font_02_sfnt_off00021bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21BFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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