Malicious PDF — malware analysis report

Static analysis result for SHA-256 09ded773e7332dd0…

MALICIOUS

PDF

80.7 KB Created: 2021-07-14 02:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cd83fcf7c9130916c3551d3b199947cc SHA-1: ef22b9c62140e69961d1a9386fc83037025a95af SHA-256: 09ded773e7332dd0551f305816980cb884b74360ccf78ccd7cfe488eb36da68e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a link farm and a lure for invoices or payments, with multiple URLs pointing to potentially compromised hosting. ClamAV also detected it as a phishing trojan. While no scripts were directly extracted, the nature of the link farm and the presence of embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • 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) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://cafepiolho.com/uploads/assets/taxudame.pdf In PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/tusinasukujuxuxapikolan.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/lpqs191a7lf9i52pqrj7tdp3i1/84813548152.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a669c4dee2---poximunisavuxewema.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dce90bb6263---tasobadodajune.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/94708637922.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/b3a76dcfc61d830e5103b08be6e0244a/35224806092.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/53244226651.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc1c901ffd---58826926730.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/vogog.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/268ae013d22e810b02f0e84a9417b163/70823621335.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/11799990850.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/58956862602.pdfIn PDF document text
    • http://babamoleskine.com/files/file/jefovotukawu.pdfIn PDF document text
    • https://soechi.net/userfiles/file/bokapojivoxijuko.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/1ed0519ab2fc2be5ba1ffb832afc3310/20379679220.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/da239e063ebcc729555ccd0578ffdf96/mezosu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a33c7d4fd---63777990676.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16091b411b9fbc---lajosot.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd50d799f40---makipa.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/wojagoguvebetubigar.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8325690572---25137608995.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///juruwevudizawovewi.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cdf61b48---24717784642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=types+of+accounts+receivablePDF 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_off0000d797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD797 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 17184 bytes
SHA-256: ab7907e2cc2f807144ad729d10c1af72bbead13aecd4140707d8958155ba7258
font_02_sfnt_off00011c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C80 10856 bytes
SHA-256: e620cedd862fa09ef55e7abfa19eeae239fc20aa4dc98530202555ab667f84fd

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