Malicious PDF — malware analysis report

Static analysis result for SHA-256 0793cf2bf5319fb9…

MALICIOUS

PDF

133.6 KB Created: 2021-06-28 13:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a3b43f820134e675ea8c890888cac57d SHA-1: e9dfaa22a0d036ec55dc58efa315c9922b8249c6 SHA-256: 0793cf2bf5319fb948bac05e6c4f695be34a0cd2f68472e458edd0a3465609c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9620

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://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608b040103c97---merakawujanis.pdf In PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/16eeff0fd17a74e80e35189840f27b8d/41520933303.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vulole.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0fc585d5ca41bba7fae29c9447f140a2/dabawolewanudosexujam.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22521f980---46943629620.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a857ae841---81041189459.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/savobulevesiwekirasu.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/pexurapiragezin.pdfIn PDF document text
    • http://tonystelly.com/clients/873487/File/kokeninexafegawajigu.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/xeguvasumeribekuda.pdfIn PDF document text
    • http://slsnn.ru/content/file/5111669803.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb93a90c3---43867463228.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7d0ce1b0d---62159560366.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160740ba2f2aa7---zododeli.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949cd757e38---45389763954.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812af846ff2---kuvusojomutatew.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cef9a8a03---pifibivodikulinaxub.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608068416a5e6---kokuwikokapibefig.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfddb164ac---91968813847.pdfIn PDF document text
    • http://megalaserasia.com/upload///40127681054.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/zunuxatuwij.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/35826709490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=monkey+chatter+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A7 29244 bytes
SHA-256: 6cb93388f3be6b8d64b73a4127b13b749d43a2c8c55c17136ba98f067c1656cf
font_01_sfnt_off00018f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F8E 20756 bytes
SHA-256: ebdf7259ec0d8eb12a557b55e678c204aec93033c73c1e01be4c1198db1538a1
font_02_sfnt_off0001c1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1A2 10664 bytes
SHA-256: 148d16876d00325387cdc94c7025ce49d1440988e83ecb7ad868e5fa812f1d34
font_03_sfnt_off0001d9ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9EA 16456 bytes
SHA-256: b567351d8817b452d7c2fb9a0144519bfd530866bceb2805c1f9ef2299257e42
font_04_sfnt_off0001f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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