Malicious PDF — malware analysis report

Static analysis result for SHA-256 8767f9bdfe007a79…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 11:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7fbfd88acda9df08d648754a73a6932a SHA-1: 0755dd3d1d9909bb759781100955230f0596fda2 SHA-256: 8767f9bdfe007a795c22c615d3c6b0ec1bf4b9954e87af76a8016785b5773462
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload sites and disposable hosting domains, likely for phishing or malware distribution. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=torrent+fast+%26+furious+9', are indicative of phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://coretry.ru/uplcv?utm_term=torrent+fast+%26+furious+9 PDF link annotation
    • http://ke-sen.com/userfiles/file/1631926236.pdfIn PDF document text
    • http://slovoveri.org/userfiles/95443531997.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/wokirojodonaniwir.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb7d95755---63442812148.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/45119720009.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xuzexitixowasagonenigeg.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/61830326310.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/70047767373.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/saxutida.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bpq9c29p0t0olgn9n3iojlipko/jugakevusofelikelawabori.pdfIn PDF document text
    • http://cy2hand.com/userfiles/17405586754.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/74771582738.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/regubuvomanejunibitet.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16149ced1e18bf---rupus.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1632327520.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/90081243924.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/zawusaf.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/dedokoxutofezipusap.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/xisaxewenodumavesaxu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e46c98c7f---82547446561.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/91583439491.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/96872171280.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/vonazolamekex.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/jowibapazedakonekim.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/35058116435.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/35665889764.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_off0000b537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4E 10032 bytes
SHA-256: 953b62b5988b49ddf7e25239cc673c90493a6cd14cc3a1a1b67806ab1b5ec392
font_02_sfnt_off0000e3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BE 17800 bytes
SHA-256: c44a797115b90a39e69ec2f8a48f4ed30c9c0ba3485b8be152acc09600b473d7