Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed377a2f647ed893…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 08:34:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6006c91950d2dd6d6ddd985e4ba901c9 SHA-1: 27b7e42667c0272106ff4699053d8dfcf2a085fd SHA-256: ed377a2f647ed8937914f5b1abe402af00a36fcf411f279fa4c1403553d22b64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI and link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7511

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://coretry.ru/uplcv?utm_term=whatsapp+backup+apple+android PDF link annotation
    • http://portamarioarchitetto.eu/userfiles/files/funid.pdfIn PDF document text
    • http://mega.kz/media/upload/files/pemosawepizesu.pdfIn PDF document text
    • http://kammed.com/userfiles/file/sawasibazomos.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/85279918100.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/3cad39d7bce1e8b896eb04dc87d38c87/mapofewomox.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/70e65ee24b4fbcfe23bde7485acc2492/togetoletil.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/magusonoxinavofiridoxis.pdfIn PDF document text
    • https://vpmemorial.net/images/file/verasolofeketixe.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132df3a145b2---39989304977.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4123b3561---22179002748.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/gexadalabilibikusube.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/duxobopawofima.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ganev.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1631259341.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/36469459124.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613421a43a1cf---86314983428.pdfIn PDF document text
    • http://sitarofindiamd.com/userfiles/file/28811893322.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/21076769926.pdfIn PDF document text
    • https://everestart.com/images/stories/file/47430953111.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ef9350358---27848614510.pdfIn PDF document text
    • http://landpas.pl/upload/file/welenusorajesevasu.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/10319507834.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/pinuvijazata.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/36025498942.pdfIn PDF document text
    • https://mlspoland.co/files/file/vefigerakiwovovofadozabod.pdfIn 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_off0000ecb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB9 16536 bytes
SHA-256: 7b5fdb7d34c0ecca96ff9aaf0a48cbd32cc3559a7e18d2f56f359b2cd349535d
font_01_sfnt_off000117c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C0 10936 bytes
SHA-256: a287220a1ba3f0238c8a7b586780ed65e3bc119ce1af72c01c2cfd79730840d1
font_02_sfnt_off000130d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1