Malicious PDF — malware analysis report

Static analysis result for SHA-256 a128de65230585a6…

MALICIOUS

PDF

68.5 KB Created: 2021-09-09 00:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e719bfeefc6df2cc294a0b866823019d SHA-1: 95437173a3cd7d44d2ac5e33a7664536d8e68be0 SHA-256: a128de65230585a686892d29bb6c9e1496ff1a87af351a71760aa16b3e88d39e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous suspicious URLs indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://krisoc.ru/uplcv?utm_term=best+torrent+for+series PDF link annotation
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e63fc74f7c46cc4b99f34f72e41b85ee/burazidibidegatidezite.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/71718153281.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/goloropepoxunirosebiwo.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109051020388053.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/tenavuz.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nibal.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331cb113227---39873200794.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/9a2f094394356ada17b8871b93dc93b8/kenopobawiwuj.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/94252897977.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/16800791216.pdfIn PDF document text
    • https://quanticabtl.com/cms_2018_quantica/sgi_userfiles/userfiles/files/70963593314.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/82910934588.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/tafegaxilisada.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11687551183.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/muvog.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/tulibaxugetujo.pdfIn PDF document text
    • https://pima-alarms.eu/slicice/file/zuretidodiwajevovowage.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613352e701427---xidijamavunabanu.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/zinadotarugifokivewamuw.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/besigujadozenalugepuviwib.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/34615412530.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161343f30aaea2---73279222140.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/xatikaduxiwutekavox.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000b1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AA 14628 bytes
SHA-256: ffb1dc024b09c1316f4e849ce696bc0600860e80a123173b883419c3fe43bb6f
font_01_sfnt_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 10052 bytes
SHA-256: cedbded0296a72f73ea821feeb0489991fa67579f8b3191a0a20caa451379bd4
font_02_sfnt_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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