Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f13518df1eab52…

MALICIOUS

PDF

75.5 KB Created: 2021-09-08 01:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9718f662adc005ab96dc37a6f5b370c2 SHA-1: b5041f9ad33f6d01306011a564c5b0bd74db5149 SHA-256: 76f13518df1eab52d1a41c45ad83a84bb0b702b417fbe2e7ee6321f98da89b76
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware or engage in phishing. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://robertfeinberglaw.com/images/edit_images/file/88055750988.pdf In PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/574de93d3c103bad547dd1068a779a18/duwefimelanusupulunasufas.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160819f17ccef9---baxizozivil.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/c1vpi6l943cuqvsdj6jbcnu82o/negedezobesiruse.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b0de717f302704a3de94e65a9abb3a29/gaxedagevas.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5e2770fd2a8662f96081d78e9e67deed/gujikuvefeniketegisidulo.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080faf27ad9b---wefibize.pdfIn PDF document text
    • http://augsburger-dartliga.de/uploads/file/5258617007.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/78ad1db198fd10dbd2d3a67dc029a292/lifiluromivu.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///46631750190.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/83916774297.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/reziwutiwevifadaw.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/19583307820.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bf973ea6b---jalakaxegexideposi.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da0c9367445---bodubo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302cc479871---24010071459.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/papewedag.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/7cedb36ef96d4c31e357b9ff9f7e55cf/nojelavidiw.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/63710918a552e03a61721c3084268524/wekudopoxekugo.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/5cca075a0c45b056208a6eef503d0da3/79833981685.pdfIn PDF document text
    • http://flirdining.com/uploads/files/vivexowedovir.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9fe8d68c2---nevav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=2008+bmw+m5+6+speed+manualPDF 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_off0000c238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC238 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4A 16980 bytes
SHA-256: 4e5f2caf9d7aa755778612f37dcb81fc81ce9f3ce21f92ec66bd7bbb7b4becdd
font_02_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 11124 bytes
SHA-256: c5320418648df805de2e42b1d5c1b0de537f235494cde892eeb6f4b9b425cb37

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