Malicious PDF — malware analysis report

Static analysis result for SHA-256 631ec6ee4f6e2aeb…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 07:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ce52a3ca616e41eb2f3565ebcc15bc06 SHA-1: 46acc357f9599b23760fd982347df77ff07c7a21 SHA-256: 631ec6ee4f6e2aebd9db1f64d13d8ab0d780a392185fbd7b212544e6e17734cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and link farms, suggesting it's used to redirect users to potentially malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports its role as a lure or phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://huntic.ru/uplcv?utm_term=answer+sheet+pdf+file PDF link annotation
    • https://kaptenhoki.info/contents//files/11214712388.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e832eef48---58559309796.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/87807331779.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160cd14c9a474e---gupatibafux.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/0ok05khkg5g9ie3425q8ncvnv6/molanugavexaxukim.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c43793218---82053944122.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/10186035491.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/83195105944.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/31054592450.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec5293ed49a---44154554767.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078a6e06bbd2---31547997237.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/37078092411.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/63673582798.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/9pi08kbtln30p072ppp39lu853/fagazi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759867c6bad---86916097820.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/69464796352.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/gavimapojupigefizedita.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/tonerivawotimil.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319f36d7d4a---rebulivunanujosofowe.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/046f5e91cf3aaecb1580151f9e4bd268/fopukuluvegiwekosi.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_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 10380 bytes
SHA-256: d321a17c1e544266ecfd2259b4a9edf3ee581226f72679d67491e4456bce6cae
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 17296 bytes
SHA-256: 9aa0ba3e530ce3ad979b99a492690cd200124e258d8d3d2e5c5f378430955dd4
font_02_sfnt_off00011a39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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