Malicious PDF — malware analysis report

Static analysis result for SHA-256 f760ab02be027357…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 07:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d7bd6ac21efe417bb3c1c23c0d1722c5 SHA-1: da5d9736bb21b91c24a1e1f8605a999557f57c0a SHA-256: f760ab02be027357872cfc979a4408640caa42bc96f320a8db7f6b01fb0b3729
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs that point to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of these links and the nature of the heuristics strongly suggest this PDF is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://medvor.ru/uplcv?utm_term=spider+solitaire+2+247 PDF link annotation
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/l8kom9ilme1m918hsc1b4s546e/58981605300.pdfIn PDF document text
    • http://surtek.biz/image/files/20150104_083842.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/k0fvnbtugb0t703q2ubintbmu1/49631599971.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/1cd8875a56840e2495c5173ead6b0359/86561857764.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/wizaxefaxobakijidipivima.pdfIn PDF document text
    • https://legouic-peinture.fr/userfiles/file/79074096632.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63f03ba820---jamiduwov.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/289ab4213d722eafca1623de3c338efe/risulunuvesasagumetarob.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ontck080u2b1ose6edpm3m0629/7394199041.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/9cnfnmtm3bt1g5tv1giqfbi3k6/tipurazuxozexalusepe.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/1fub81vb1hl9fichlpvl8jjl65/47098078419.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e4b9bef9d---vawiraku.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/rajixulitefoketubetef.pdfIn PDF document text
    • http://xtra360.net/campannas/file/zidudewopogulu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3ef12c384---turebonob.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b76e5df0378---nisimolabezefupetemezipix.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-30/20210530210458324919.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7233b08212499575aa2ab9fb0abecb21/87577280827.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/10035735933.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4a363d29---zemafujenogawufoku.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/romolejaxi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e8f8fe90---fixup.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2058f74212f42d4ad8b7af533ec3abf3/47774376843.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/lonipera.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_off0000ecec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 16376 bytes
SHA-256: 8bb73b344854b98c68e4ce15b9e8926faaeedddf7d60226b6e8ea2038337c4b3
font_02_sfnt_off00012f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F73 10604 bytes
SHA-256: 43bcae0fad2b9db0b812a922e3ba87a457e0081659ef6627a6eb97254c7e89f2

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