Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ad17f853455155…

MALICIOUS

PDF

129.6 KB Created: 2021-08-24 23:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 84f8ce5bfe83935defef3265c71eea33 SHA-1: e562e2e97ce5c257a382c8f8af3ee65215d7680f SHA-256: f0ad17f853455155106f564e7770e3f6874203fd4bad782fd51b8376b003c26f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://pixomot.ru/uplcv?utm_term=colic+is+caused+by PDF link annotation
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fc779c63b1668611eab05f7f5578bebb/sakedazeda.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2cb78841525bd2c0c93fbddeb1d94c75/37164814779.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/13078228140.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/zusagex.pdfIn PDF document text
    • http://berbun.com/user_img/file/wavemotewejosorowufom.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98bb1ea314---65025563948.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/92526162507.pdfIn PDF document text
    • https://yuss.it/file/30128823411.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/pipememetodogetarezugefis.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/51584238397.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/55667079456.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/6895195596.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/85274535616.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/17237427060.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/bb20f81355512c20e0bb6e738bf001c0/kudowowulakuvewi.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf840f391a---4974824576.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/sedokonibevusupajutaxuf.pdfIn PDF document text
    • http://07-3739589.com/CKEdit/upload/files/gifatope.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/87350888123.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/13738142797.pdfIn PDF document text
    • http://lblussana.it/images/file/42253290511.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608294d6871c8---wixodamukadogeda.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bf30857b2---kifivaworijemilipinoje.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/34972415097.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cd44800742---lizuwi.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_off00019887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19887 10448 bytes
SHA-256: 4840b65d42925ac4c3176d3c4bd7610e650bfec6b2a79f51ef0a39c0432338df
font_01_sfnt_off0001b05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C86F 19036 bytes
SHA-256: 45df16df8d2eb03d870383e410b72f8973f6d6f92717810e4d6796098547c411

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