Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdedca88e6c231d0…

MALICIOUS

PDF

67.9 KB Created: 2021-10-03 05:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: d4d153f3410afdaa65082bbb0adfa2e1 SHA-1: 1fa31cbdc2d803269d559969c6d39c9f991b8897 SHA-256: fdedca88e6c231d0aaeebf3a4abe2f3444d7e6f691c95604ac4ae504a78bf087
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7691

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: 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://philabc.ru/uplcv?utm_term=buy+to+cover PDF link annotation
    • http://tecnoservizi.com/userfiles/files/40250103272.pdfIn PDF document text
    • http://exima.kr/userData/board/file/47186111230.pdfIn PDF document text
    • https://arendic.cl/files/juzofabewanabopeso.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/mamupolid.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/rumojiluperis.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/parul.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///10083975957.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/dodebafilomu.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/75208563494.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/gugusedezaruruti.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/51912595244.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/muguji.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e811c18376590a3bcf55042cf4d9edeb/28251630531.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0d430d0925581f1a0dae5735afcde62c/jifilomuxakilegixin.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/kabibamixikowu.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/juvinuwejokosuzifirumagan.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/difepukelesagefidetade.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/sadipaguniwamatefanumanob.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/11281949359.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/jijodararu.pdfIn PDF document text
    • http://siltukai.lt/userfiles/file/41933998224.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16156b8a400739---dajowitikokazulop.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_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 17640 bytes
SHA-256: 348335c70a315f50cef00727a7f8d3967daffb3ce0249da0382ee9ec1ce90cae
font_01_sfnt_off0000e06a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 9984 bytes
SHA-256: d05db1f383b353a31b9b03726396e50ce738130cb78cb89fa65ec88d265e741b

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