Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7103cdca4e68f9…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 15:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cff43d5185633e413301b03fac5ff6be SHA-1: b44c66de395eeca0f0049b58b8a2d0f853f9add6 SHA-256: dd7103cdca4e68f933e2391ac0331aeb5f91c99bcddef6099ffff062891dd1e8
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links, including those with 'utm_term' parameters, points towards a tactic of obscuring the final destination and potentially evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://amandatravel.com/userfiles/file/24266993851.pdf In PDF document text
    • http://chiari-web.com/ckfinder/optimist/files/geniwutotaboribozibog.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/f72a99a423f66955e61f3542b0080e2d/xavapaviwokef.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f70e94cb1---datufajisubutawav.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/3798518592.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/94653774231.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/30148797195.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0ee905d4c---1545988088.pdfIn PDF document text
    • http://retailcop.ca/files/gejalorejaweridutid.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139dd07e04fc---28480740821.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/61bec622ca10530449899048b11634e3/66759463807.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/wijuwupefefu.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/jubogewosoxavapagisul.pdfIn PDF document text
    • http://hidropro.hu/upload/86346734930.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/zozakiwexenipep.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/wituxuveko.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/revurukofavuseralepine.pdfIn PDF document text
    • https://atlantidegattico.it/file/refedoziseloxi.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/16297762794.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/65f1e7f7371cf30df6a2c6acf84263e8/bowixifokikutenudak.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/ligojuwumepukitirufugakap.pdfIn PDF document text
    • http://okgwa.net/50/files1/file/pejulegojemukekuseroxofew.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac624ce68---bediso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=law+dictionary+apkPDF 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_off0000df2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2E 10408 bytes
SHA-256: 748bacfd2ba6d3d15d614ccb189e14231245c2f5d2083544a8278dfab799c2f1
font_01_sfnt_off0000f6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 18024 bytes
SHA-256: 0c88b6c0c3637917c383e915c890815b6b0bc269104a9fb3dd384c8cac9d22f4

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