Malicious PDF — malware analysis report

Static analysis result for SHA-256 808c05d770bf484e…

MALICIOUS

PDF

76.7 KB Created: 2021-09-01 14:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8c76130b599f157a06b30c2424ebacb3 SHA-1: 8af7a97f37677338c1d28c40bb54d003c311783c SHA-256: 808c05d770bf484e412ca1f760b8ec96d1685ef5258f372032e1cdd27a78fb62
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, indicated by the 'SE_INVOICE_LURE' heuristic and numerous links to potentially compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs likely serve to redirect users to malicious content or download further payloads, aligning with T1059.007 as the document likely contains embedded scripts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://laborke.ru/uplcv?utm_term=liquid+to+gas+is+called PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/33d0d72636cd8be451e31ddff97f8bfb/zotogevetezikapedom.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/jekonevagubusa.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea69d0677b---netavibimelot.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accc80f21b6---fimup.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607699515712c---4132662773.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66b966d0f---luzusazozo.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160f186a3196c8---31807548562.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021823_145040_302.pdfIn PDF document text
    • http://funperm.ru/content/file/8122938805.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/11414218492.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/31ddai8okj0cckt3r14ghcnl9c/jirenejokemokasitogoruw.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/padovutigitigakejujin.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/91194739476.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afd81544aa7---6426480554.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/defaluzepifimipetumube.pdfIn PDF document text
    • https://electroagro.es/pub/files/94546395507.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608759f699774---fisozigamesovonimakeg.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/e3u33s5tp315nf4ruia3u794g0/99714895388.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/jabago.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c096105fef---23608087956.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/dc248ad2a1a8043df920b9925b2cd949/zakim.pdfIn PDF document text
    • http://ipceurope.com/assets/file/50909704051.pdfIn PDF document text
    • https://temahr.hr/files/fasetofugemojatesikepok.pdfIn PDF document text
    • 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_off0000cab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB9 16892 bytes
SHA-256: 82de5ca8d43282f1b7eef5628d68bf30e37b09f3f0b0314adf10bdcda688a167
font_01_sfnt_off0000f63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10544 bytes
SHA-256: 2a94bdb3aa1fd3389dc7cda272477d55da9c62c7e7c24494edc99408337320d8
font_02_sfnt_off00010de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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