Malicious PDF — malware analysis report

Static analysis result for SHA-256 05d79fddf17732fc…

MALICIOUS

PDF

91.3 KB Created: 2021-09-03 21:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: b4d14a593669ff6716badb2dbbf66fb6 SHA-1: 9380da104a8f9252f46f157e48ecdb7eae4bd104 SHA-256: 05d79fddf17732fc69f53dcdfe20e4ac4b3c2b2c7e1d4fcb357f96a6d50ff639
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that exhibits characteristics of a phishing lure, specifically a payment redirection scam. It contains numerous links to external PDFs hosted on compromised websites, suggesting an attempt to distribute further malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b3246f4121301eb1a90a3e66518f7ff4/favuzit.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe8adb363a---darur.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/bf1b2fe78f1a02978ad6d5d488d7ed35/60181582655.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160deb63ddd44e---kebakipanabak.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/05b6e535641a8c7e6a203ebfcdad89ab/52640926065.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc217123afd---rogenopokegolesitozo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c23f7f22cf6---badak.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/76471922429.pdfIn PDF document text
    • http://apcmagon.com/userfiles/59652303998.pdfIn PDF document text
    • http://novichiha.ru/pic/file/surewunej.pdfIn PDF document text
    • https://europartner2.pl/uploads/gufid.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/36158000464.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/93781c397894eeaa490567c2ea532f4a/57945355426.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a43624df69fad05fe0c8700a99475438/13585087167.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/37591613266.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/zilevoborimel.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607db36880f9d---28906778823.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/vapisid.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/5th6d39fle6ibjn9arhjrq7g5n/88058124499.pdfIn PDF document text
    • https://robodom.si/files_vsebine/perudisu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/l6k3klf2v6vtf26l9q64jf50j0/jonazojixanulavigolewe.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/jaluxipenuraxi.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/65190746064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=wcw+nwo+world+tour+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_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 18608 bytes
SHA-256: dbf253e78914bff0321228b1a9d4d13f8bd8f3de8fb077a2be97fbe73afb34d0
font_01_sfnt_off00013034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001484b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1484B 10320 bytes
SHA-256: 3ac01f021bef60fba9688e68e2355cd9e8b09f918d5018772fe6ac440b2a50ad