Malicious PDF — malware analysis report

Static analysis result for SHA-256 11b880eea6ed8414…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 12:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aec7c718108b018e85825df446c6ba03 SHA-1: 0caa11f6eb47e1891b0603ee38aa54e37aeada43 SHA-256: 11b880eea6ed84143103cced11d4d49699d80ac66ad8de10ecdd786d47f95ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6200

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 http://dpsnowodworze.pl/userfiles/file/67812089639.pdf In PDF document text
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9bee1c43f---78469728619.pdfIn PDF document text
    • http://debrecen.varosom.hu/userfiles/files/10368992075.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/jilenuvekebadowe.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/wafanowujezudubexasuraguz.pdfIn PDF document text
    • https://sujatasfoodopolis.com/ckfinder/userfiles/files/xoxevan.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/sedetapagelivulani.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/95732626744.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7e3000321---lavotidukuridira.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3a55d1f14---mejanizavobiguvosaso.pdfIn PDF document text
    • http://vietcem.vn/public/default/ckeditor/files/27872857131.pdfIn PDF document text
    • http://strandedtattoo.com/file/29634027862.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/xobagumitonoxakijosokago.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/jasajetiwiriradekamowebe.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/38879810084.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/kufedir.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409bdcad69d---jikizemit.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/13031139669.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/jaxaxugixatadibetu.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/36593630811.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/labalitalujirasodagivote.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/liwuxumadazagexezenuz.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd83d2b8cdda6d1b5712c4eaa4744e75/95284392655.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/kegigusaxogagu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nordvpn+mod+apk+happymodPDF link annotation
    • 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_off0000dd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1B 10372 bytes
SHA-256: 7484235c7fc5d368caf24e66ca43f1e8e48fb09de3a853e8818e57270ccf0ef9
font_01_sfnt_off0000f44e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 18880 bytes
SHA-256: a2b0b309d5156fa76a21783eef1c8abd0c5e9820839ae39d0e4abdfd842c6a16