Malicious PDF — malware analysis report

Static analysis result for SHA-256 da90385abe775dbe…

MALICIOUS

PDF

77.6 KB Created: 2021-09-14 09:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e715df51713633a0982a1891b470fed9 SHA-1: 5b22ffc465a24b300f972c2765f59793f415a8f3 SHA-256: da90385abe775dbe83beb85c6b4647496e6211c5c00f8dafe1130b8ca2240d1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links to potentially compromised CMS upload storage, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5242

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://allytemp.ru/uplcv?utm_term=comic+strip+online+creator+free PDF link annotation
    • https://synersys.fr/contenu/file/mesivimurebasiwepafi.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/63231559792.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/48163444146.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/78412239163.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/73c6807799dd5c5575b0ea0a9bafcdbc/jijetogedos.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/22044742513.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/84219735034.pdfIn PDF document text
    • https://phm.vn/upload/files/jaxipasulegogijalizegome.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/79915283884.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/xamab.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/22912319595.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/34885675321.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/xasus.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/70949469900.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/dulipofawutatoferolubopud.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/37851958774.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c42b6df99fd3e515bc82e8798a401aed/jususesimasoteka.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/vezedorejajuvamuno.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401e5c9274d---zanakukaluratu.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/73570436305.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zurusak.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bdd8b47279---7653674162.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/90915098521.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132568520810---2059499440.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/jogawojofamadapofejarab.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_off0000d760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 10672 bytes
SHA-256: 092195890ba45024f91a15412b5890c0729221089dba2fa54d668e914ccf610e
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 16584 bytes
SHA-256: 80b63f6c6e873957342e87f5004d28d5e68a9043d5ef3b26d31d9d4798ff58b9
font_02_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1