Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded775e94bff73ad…

MALICIOUS

PDF

79.0 KB Created: 2021-09-20 16:36:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: bcfd944f5b2b5aea38278ce35ca59e7b SHA-1: 7950eb26fd405fbd2f06c62392b983560a5a277e SHA-256: ded775e94bff73ad5d1fe488eb1f006e55fdb32fa8f78067713123ed32ae417e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The document body is unreadable, but the heuristics clearly indicate the file's purpose is to serve as a gateway to other malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7959

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://pistant.ru/uplcv?utm_term=best+app+to+play+music+on+android+phone PDF link annotation
    • http://architettosbaffo.com/userfiles/files/nimosinorapag.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/92401448268.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/1382867122.pdfIn PDF document text
    • http://halmar.info/userfiles/file/kerofoxarodovesatanitod.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/64985820975.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/7048501055.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/5320108970.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/a317279974a72ef59a1fea082f83fc58/83998304471.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/69541765001.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472427af104---53580882838.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/05257f8204d9425f2a914f987879ccad/rigodol.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/47010222950.pdfIn PDF document text
    • http://erex.hu/upload/file/nivuzuxirizut.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/vitipitewizur.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/e842613782e4bc89151738f6f473bbcf/61915042651.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/vakin.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/pozezekoseloruwedowobar.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/44239356294.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/rotozuxemolapi.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/jenixemerefanebipewomatip.pdfIn PDF document text
    • https://ikima.fr/uploads/file/3534952494.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/80644896958.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_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 11044 bytes
SHA-256: 2ed5d7ce7c67d11d33bb2ee2cf402b394e2d9aa88976003b070afe6e1da50e33
font_01_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D39 16800 bytes
SHA-256: 13f94d371982c61c825d4d318a6f29a86bb481b00bfbc5e6f936813b1d4aba7f