Malicious PDF — malware analysis report

Static analysis result for SHA-256 606cec73c56b7318…

MALICIOUS

PDF

119.0 KB Created: 2021-09-15 08:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0046c18f10ce6496b5f2723d53e2a891 SHA-1: 98ea2ac4fee456379fd5d8a0dac2115fe86a4fc4 SHA-256: 606cec73c56b73189e8699c4732995c103ece38f53f5408f41005566ad93e446
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript (T1059.007) strongly implies an attempt to execute malicious code or redirect the user, likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=el+lector+bernhard+schlink+pdf PDF link annotation
    • http://thienthaopc.com/upload/FCK/file/48228620039.pdfIn PDF document text
    • http://come2menorca.com/images/file/jijepuwopemeruzumedaxanis.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/wesepoxite.pdfIn PDF document text
    • http://mweb.cz/images/file/wixebatavozudake.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/65004568215.pdfIn PDF document text
    • http://apcmagon.com/userfiles/sumunozuxizejoxizuwafazi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136aa8ba7ccb---suzonokififisi.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/vureza.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137577287b9e---94314727907.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/mowaza.pdfIn PDF document text
    • http://sissonne.hu/editor_up/supokiwud.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/tuzajevov.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/tepubipejusenivukilewolos.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325742ebedf---lovep.pdfIn PDF document text
    • http://indyskischool.com/ckfinder/userfiles/files/17579668409.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/38118879179.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161412cdf02d36---xaraxiguvepusigijerid.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/xuxuborozenunezivigazowup.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/87400238404.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/051613242742.pdfIn PDF document text
    • http://texmet.pl/userimages/file/21666007660.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/9954098938.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/xezaladigunonifula.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/81849356790.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_off0001660a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1660A 21680 bytes
SHA-256: b3fda6b22319cd6c9514b7fdecbaed78a7c596541a3ccb35e71dbc09a5b45eca
font_01_sfnt_off00019bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BD3 10932 bytes
SHA-256: af31ccef4211d116a25af50d220bf19ba163b551c7afa7401d709a46570fac2c
font_02_sfnt_off0001b4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B4D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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