Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7737a8254e651d…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 00:26:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 271bcb715401e9da61bbff3cce279d51 SHA-1: d95a3dfd0346b001771a11aba05aef3b72bf9eb8 SHA-256: 3e7737a8254e651df6e28c04839d70320e49ec672ed6ce967bd07bf0565f6f7a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a phishing or spamming campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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 http://okmarin.ru/userfiles/file/xagazovidanumajowerefo.pdf In PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/dupefagit.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/pebumina.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0603356d07a4bf005725231341b5ccf7/13582801624.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/82976254055.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e8c9ee1e18d38bc9cdd633677fed52cd/pewivubujipubinixunu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4fa2c90761---zepesojag.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/9c88e189b163e18bdf064f853535bf73/11900882814.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/ruguxovamakezoxixilamaki.pdfIn PDF document text
    • http://uci.ir/userfiles/file/41936307927.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c9a9f4409fb7157cb57c85bd3b90a5e/36683150632.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/sijazatekob.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a77235281d---tuganavujamigumojuxini.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090f36240abd---87298527344.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/92328935865.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798b7c2d961---fipirevogewemozow.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a38d557cdf4---66569063387.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/1312658627.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/87207940560.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/nirajase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+report+uninhabitable+living+conditionsPDF link annotation
    • 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_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 11176 bytes
SHA-256: e122adfe7965c25ff52e7b7aee1679e649332303716f7a76b8eda26db4af4da9
font_01_sfnt_off0000fd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1B 18220 bytes
SHA-256: 8ad0be77b3b4e5d965d9d1b3f37faa0083ea6373eaf93e2a5f2927e32e446312
font_02_sfnt_off00012a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A88 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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