Malicious PDF — malware analysis report

Static analysis result for SHA-256 de69f2dd4211a380…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 02:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73e3888de7f1991bd37708d34c000d7a SHA-1: 9d3780daa54f084928b8bc270d0d2ec94c300aef SHA-256: de69f2dd4211a38097c8fcb1004941995664fa925448cf61962c94e46128b94a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are part of link farms hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm heuristics suggest an attempt to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ketchas.ru/uplcv?utm_term=modern+android+icon+pack PDF link annotation
    • http://vsrru.ru/userfiles/file/digotere.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/37920942052.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/69147126840.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/467407621.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/radapunegavagusezoragi.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1613c75a8912eb---loritoku.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/nekesewudozis.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/viberipal.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef4da3fb5a---gazizafapofuxabobiz.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/guxijaxuxovavak.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/bevesaxik.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/gomaluji.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210904093831.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/50619731953.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/popumojakoxifolus.pdfIn PDF document text
    • http://sdds.be/userfiles/file/dekevudogoxivu.pdfIn PDF document text
    • http://grnca.org/img/files/files/58847531567.pdfIn PDF document text
    • https://tempegaring.com/contents/files/vevikexu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8ad7118d3---66809948115.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/12445745020.pdfIn PDF document text
    • https://umartravel.com/files/71299410980.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/98112883696.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1208322b2---zizerolopevu.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/sajuni.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_off0000e6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D8 10280 bytes
SHA-256: 078afeb4785be3af0fc451148e0ea0969d725c6b9d7742544c4032ba428ef9df
font_01_sfnt_off0000fe07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE07 18868 bytes
SHA-256: a79b336d6a8af3f90984cf690972a02aba1338848e55d56b4475dbf03b4391a6
font_02_sfnt_off00012ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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