Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ea76565a221387…

MALICIOUS

PDF

84.9 KB Created: 2021-07-24 08:18:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 67e6cdad04ebe8486787052da0cd2377 SHA-1: 0a8bb55dbad6b8c2805d39014b3c20c13d03344d SHA-256: 91ea76565a221387d7a21047865db8e1f3e0127c81491a932d728c49c5e42de8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links, many of which point to compromised WordPress upload storage locations, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious content. Although no scripts were explicitly extracted, the presence of embedded URLs and the 'Fake invoice / payment lure' heuristic suggest the document is designed to trick users into clicking malicious links, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • 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 http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7ad26a348---67022091284.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070493f7abb1---16760601340.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/95155192692.pdfIn PDF document text
    • http://www.tiendadelbordado.com/ckfinder/userfiles/files/suvisemekod.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/rokewuvomixetejabenajul.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/sivavujojiwatanobunofosa.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/ttnjmetb27nf0sue0kdp2cs0bq/45525404890.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/70196180650.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7dc9165c6207215f45f431792937a8d0/saximorozumutugibi.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jl49nfi2cc3va81l1u4ep2g4ne/gejuziselozupenujuraloz.pdfIn PDF document text
    • http://chayka-svg.ru/files/rozofurojodexarunozididi.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/934ae65ba312f3ad8abb814c3b8a1d37/3048785166.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/v39dvp9uab1j5bltt38588as26/30009340689.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/lixekaxugoxakisaxovuxisod.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/xatuvesagumo.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/woxubafofok.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/fadusiveninezinepib.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/aent2b7jf8962hrb8gs07ac3a2/99918761867.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/31736957526.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/wavigijudutabisoj.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/tizusojodolukimeki.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b24ea5cb18---69490643340.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/66610fe557ebf0de08dd610c2af33429/tuleduvajebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sap+s4+hana+fico+tcodesPDF 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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10102 16704 bytes
SHA-256: a05a64e3a058794be84c4ee2a692eaab43d7828d1c12c72afc9865b6ef25a5f8
font_02_sfnt_off00012c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C42 10724 bytes
SHA-256: 7a1bccfaf723a50f09373e06efa53826dfd3c1aae243fea92b3da63f2565c43c

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