Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad95cf831deb995…

MALICIOUS

PDF

70.8 KB Created: 2021-09-09 08:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 02b14856650383bb8240ba7a60ec1be0 SHA-1: eb72a5bcbe59588a8b8037d386276bba0bbcd135 SHA-256: cad95cf831deb995c998ac5cdc0a8281f947558d51af40cdfe0c19e9f034962e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using disposable hosting and compromised sites for distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://philabc.ru/uplcv?utm_term=only+fan+hack PDF link annotation
    • http://abwrichmond.com/uploads/files/70644221556.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/zumemaposolojukigirotix.pdfIn PDF document text
    • http://cutskytools.com/d/files/37918786619.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/57256961442.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/57857366187.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210906_163618.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fee5b774c3---febakako.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/92224901116.pdfIn PDF document text
    • http://hstairan.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/19508662604.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613623e908666---bikodozagux.pdfIn PDF document text
    • http://jainfarms.com/uploads/28199599889.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/lilavolevezezadamizi.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/34690541261.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/kebikeberabunude.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/bimonabenedogesovupuzab.pdfIn PDF document text
    • http://4rrecycle.com/files/file/liledik.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/dalifo.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/78558360063.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/vipolawul.pdfIn PDF document text
    • https://macintosh-szerviz-javitas.nuttydog.hu/ckfinder/userfiles/files/71194018650.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613036c542b0a---27460505629.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/84959500037.pdfIn PDF document text
    • http://ippon.lv/uploads/File/sopagazavexuxitoti.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/rebobawoxobabekaku.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/zizugegabemawoxebone.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_off0000b745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB745 9952 bytes
SHA-256: 2825f0b6b51a5b46e989eb832fc49f3900037ea6f352daa23da4ed308312c14f
font_01_sfnt_off0000cd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16136 bytes
SHA-256: 67a1fe34881e547e8b60a37579012a21f57cfb81b730272d10e74c04bdef7b69
font_02_sfnt_off0000f650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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