Malicious PDF — malware analysis report

Static analysis result for SHA-256 c037e017379fbfee…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 19:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f63e120033c5a0090e739037ea3951a9 SHA-1: 0066f073417375c4dda0fc7f8e217fe20c770f72 SHA-256: c037e017379fbfeeef701d1cbca3a5d14859ae86f565c65e7908962418d4e32b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm with numerous URLs hosted on disposable or compromised domains, indicating an attempt to direct users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://gucaoyun.com/uploads/file/012147162767.pdf In PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/96003025156.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/83032275398.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/rizirejomezarakelamof.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144a3e504bb4---gojogire.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/47040020173.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/52942884228.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/subonutenijaf.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61330184125cf.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140719c85c16---sedugerazakunijubawa.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/gexemiwanuziri.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/paneb.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/bojigan.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/mafavaratikiluniwunuxa.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141f03ad6f01---nubisotazati.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/jopubutixaxexajalobikosa.pdfIn PDF document text
    • http://livestocktool.com/d/files/94958454697.pdfIn PDF document text
    • http://tradotel-riviera.com/file/jejarakomutajero.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/kovexam.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/56705336591.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/39084416085.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/sojigavokipudafazatag.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4b511183---kulajijiwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=content+of+marketing+plan+pdfPDF 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_off0000eb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB11 10796 bytes
SHA-256: 832c34fe4f71ead7603c55a002bac92df9499b1302db74d063deb8084ce87b79
font_01_sfnt_off000103b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC8 18140 bytes
SHA-256: f132efc06bbe2fc2219fc3e5d8ef5227b609ff370d541d2e946de44370b4fd1b