Malicious PDF — malware analysis report

Static analysis result for SHA-256 9157a6b466aa2603…

MALICIOUS

PDF

112.4 KB Created: 2021-07-16 18:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11b59adcd38b450c6e0094108dba4f04 SHA-1: 33dbd36a51a30b7c47afd46bf2fe82c6bcd5ad6c SHA-256: 9157a6b466aa26030ae572c88a1aceccf499351ebf128de4f4f8d82956493806
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4186

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. 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://directorvincentchow.com/fck_filemanager_upload/file/89421172400.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b492496c---bamupezetomedota.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16083f69401242---93010675252.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f9b7c625998ff068eb8bda1ad9d79e2f/69418374786.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160b90dc18c49e---gipulexezos.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/65683092414.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/86365605055.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3fc43f342044819f457a67b848ecfc99/tepuxisawuledodurotese.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/37396873481.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/c69ac2f093f8c4b8df843e00c7766b4e/47422252056.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/deginu.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/23464934851.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a13f3df8---gakozirokeferabikumaxote.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/perifomurejijibevogok.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc205e2f584---nanugodovuwononinisexome.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160855d2425926---ponig.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/84pnmtvafuhsh2a6eld36b42kj/20181521236.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3bc00f48c---69400196931.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/kelolofusefone.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/69954115126.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/42bc80d3a34a938c93a8f2da4bfaadd1/wawikusabugerevowuvasufet.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/zigivefuboka.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/lizarisedukovokanujazumef.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c948a56ddf4---72134728447.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/zupexefaxigod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=draw+the+circuit+diagram+using+symbols+to+measure+the+power+and+energy+in+single+phase+ac+circuit+with+unity+power+factorPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001579c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1579C 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7
font_02_sfnt_off00016cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CC4 22360 bytes
SHA-256: 9b38ece168c491426ce10127e3958b7f237414af64b0dc0b9fd44ea8554159f6
font_03_sfnt_off0001a728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A728 11508 bytes
SHA-256: dc3d9602eaf66308b818a734647a51bf65f58734948eb4c813acfc31c31627c6

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