Malicious PDF — malware analysis report

Static analysis result for SHA-256 d040e5f609b4148a…

MALICIOUS

PDF

83.2 KB Created: 2021-07-25 00:19:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5a5a955325d8856ad92a2e182eabc47 SHA-1: 9298dc336aaea69737324ab6666d76dc1558268c SHA-256: d040e5f609b4148a29527c2177900b323244f8d061f86cdafd55ac5d0cf40c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9357

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFNoValidXRef. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ctsgroups.asia/images/file/91588943991.pdf In PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/leguvaderafaxedifimawi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d6bf5ab05---fubojeselaleto.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/9fd1669f3dab50bfa19509468c9def89/84178896827.pdfIn PDF document text
    • https://buka.ru/sadm_files/kedunipajujejoxebilumere.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8jur99qbt6f5941vetf4emvp72/sozerugiwixino.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609351e9ddb61---36408244033.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1fea983ef5edf9152f919fbce243081c/42985208942.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/xemikepuporamuf.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/5a87a33cc19d43a9ab57a0125d8efb1b/polapojage.pdfIn PDF document text
    • https://semut73.com/contents//files/38443641951.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/57250657677.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd845cf35---wikomuriwoso.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/c2f9d463045f8eae65a6e3bbeec5c7eb/xoxet.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d65ab7c3---34959538204.pdfIn PDF document text
    • http://prosquash.by/data/guvefebu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ea692a21b11de9c9a4304901cf28d766/jawedimoninut.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e108a44ff1---95695255903.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210724_4D4142D785AA7067.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607beb41812f0---bijizufux.pdfIn PDF document text
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/towodapukezopedinig.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094da20da7cf---76852082801.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfef5cb757---29557300048.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/dariwizajala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=exploring+psychology+10th+edition+david+g.+myers+worth+publishersPDF link annotation
    • 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_off0000e74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74F 17128 bytes
SHA-256: b5355d6ffc502e9f13c574c321cb0c3a44bf06da68e738d3b0a804a06ff41a0b
font_01_sfnt_off0001140a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140A 11792 bytes
SHA-256: 18832c09281c777d158283e78d700da857df297e2ce299579572792c729c67c9
font_02_sfnt_off00012fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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