Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcb90e6069fe2a7…

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 20:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7afe7f9f82aa35e958878a2fe1916eeb SHA-1: 47d8621c3ccc60f5c4f756c77bfc50f0d3910996 SHA-256: 1dcb90e6069fe2a7000ac29bcde3587b7c2c07f073cadc117583c2dbb9f5e94e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, further supports the malicious nature of the document. These links likely serve as a mechanism to deliver secondary payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/207e8faea9e2231cc751a0c7c15d1a95/rosefosovubipoma.pdf In PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/metawapagal.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160732aba34684---xenuzesokomipejom.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sq2vkv51spfpts6jdfr3btueeb/sitenovefuserob.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609032dd2ffc0---dekajatamizif.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bd858a07d---78645755205.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/dopizesasuge.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/moxanepufilalivetutul.pdfIn PDF document text
    • http://ave-france.com/pics/files/51790121608.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/kemumogobipapijaxideda.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/c1355ae5b6b045b9e7e09e55c677a450/62508367460.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cfa8d279a2d64cfeb4d0a8e96e5f183c/xewunejebepapiz.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/kidopetumelodoxukem.pdfIn PDF document text
    • http://ecole.ru/text/images/file/5617644862.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/zedugexuvijenop.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/69090425040.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e9720ce02---rixarogo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/61629572321.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tjsmicd6nl75ucbn0f2v1ekd4l/vajobuvenajetazexes.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4b6767a660e5b95827bdff264c9b95d/sipeginiziwuxugimedolope.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/pamanepafif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=boning+up+on+bones+worksheetPDF 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_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 10792 bytes
SHA-256: a8a02ac25cc3f7663dae66e3c6494d380faca2541377bb2fb92cb465d37008a8
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11133 16908 bytes
SHA-256: bc5a4a5668bf5fbb48dac25cf4d28f04fcc25c2e7ce5f6a511670f38adf1f632

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