Malicious PDF — malware analysis report

Static analysis result for SHA-256 4acbfebcafb592db…

MALICIOUS

PDF

92.9 KB Created: 2021-06-26 04:41:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 815a7a39de237dbc9eaa9a14e8ee0282 SHA-1: 8e3eb0cb1dc53fb5b3bc5bdce65e108a2a5b7b80 SHA-256: 4acbfebcafb592dbe5d3511ba11839e52face9531c9c4625e81d2ca1618db865
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://queure.ru/uplcv?utm_term=itil+complementary+guidance+is+correct
    • https://chaplains-camps.org/upload_picture/file/jadalejegoni.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607769bcb70b9---60431176652.pdf
    • https://aprilboya.com/userfiles/file/22589353394.pdf
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/sazopezufisubipavava.pdf
    • http://agnieszkapawlik.com/userfiles/file/34967012364.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/245a53b22e246a3799987fe77cc8f0e8/55941892437.pdf
    • https://sunrise-photon.com/upfiles/editor/files/rimamoretef.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160791c00380fd---velokuvototebejabuxawava.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/2027644daf43c4dea056f689648439e8/82986680755.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/179cfa97e2ced80f4d4d9e2d531e9a1f/jokerizejotigomeve.pdf
    • https://monyetjoget.com/contents//files/42571543471.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608396acee2cf---92277080711.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/u43vf8i5p734prv6ppvfkllk8l/vuwazapinova.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760bbd58ced---kazaniputajifonod.pdf
    • http://brukbet.com/user_images/file/jonixomunozoratugopoj.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c510365abb---2548363915.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9bc9b136b---zutinofabekomazegagunakit.pdf
    • https://agentcctv.com/userfiles/file/xedivegubawob.pdf
    • http://krikrik.ru/uploads/ckfinder/files/mexuni.pdf
    • http://on-video.com/movies/movie_data/file/51441100521.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/ff6a358ae0b065f4a07943c2012e6763/56702275458.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/01c8631c8e8a80ebaeddbd27630e1878/66526072107.pdf
    • http://ampletrekking.com/userfiles/file/80768402443.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/dcd8089c67c618d6652ab52342ed8b11/58852570751.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/61avs69r4s76ms0e2druandajd/menafofemepi.pdf
    • http://vimbark.sk/editor_uploads/files/12376370699.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c802e58a---61391404948.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a5e.bin
3d7bf3dc6d768461e1b091b95a23d7baf0c3b8aa6a3a0342dbf9523d21f900c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5E 16220 bytes
font_01_sfnt_off0001344b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1344B 16792 bytes
font_02_sfnt_off00014c62.bin
331c776ffbe904b7493a33e8abdc6b4073b28c141cf23774a72c1e599c14a174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C62 11020 bytes

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