Malicious PDF — malware analysis report

Static analysis result for SHA-256 978453bf345e0f51…

MALICIOUS

PDF

77.1 KB Created: 2021-07-14 02:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f3bb3878e91ddc8c41b9d1cfe296a56 SHA-1: b89859edd6ed398c372c068f721d90014eab2a40 SHA-256: 978453bf345e0f51090998bd3ddddb59bdeeb09e72cec3d053f3ddc66a571b3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond what the heuristics suggest.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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 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=dodge+and+burn+tutorial
    • http://eprdel.cz/userfiles/file/5832771846.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/8813659677.pdf
    • http://lightningriskassessment.com/ci/userfiles/files/23076316687.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f594f0704f---48442726799.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776ca1110e2---wemevepoxenizan.pdf
    • https://llsindia.in/FCKeditor/file/37493165661.pdf
    • http://makinsushi.com/uploads/files/zosagabedasexirokaxi.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4c3aeffbb---mutilemigel.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/51618605268.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/e62a8ae04f33453813aa92b0564af3c0/97052580115.pdf
    • http://scandirent-new.ru/uploads/assets/file/65243171357.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/768a6598a929582f93fdfe744064803c/wusasuxorami.pdf
    • http://redemaisfarma.com/userfiles/file/35196069213.pdf
    • https://nazrabilisim.com/calisma2/files/uploads/sosolirodo.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/4fb0ba58753ccfa8be70c577aeb323a0/wiroz.pdf
    • https://fnb-concepts.com/images/uploads/files/90813652934.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/0cd6d5704f4a36d20d88aa4c80bc29f6/robopofudugajikepife.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/923e8db15c3b9089deb54aae7bc94129/70730225598.pdf
    • http://expertsystemgroup.com/file_media/file_image/file/petidug.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c8c4c213ce8e451e3870501685b0a2a4/buteboxe.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0bf6cb586dbbcf8b07345509806bcd77/vujolulobejejiji.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/25e32af2ad121f3ae97166f624d297d0/52113705776.pdf
    • http://amctop.com/board_data/editor_img/file/202105161341.pdf
    • http://royalwedding.jp/images/blog//file/92127922227.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_off0000ce05.bin
39ae8a8a2c3b9dc0d56f94be6214ce0a41c7110c8906a305c4db73a72cfcd9a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 16316 bytes
font_01_sfnt_off0000f7b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 16792 bytes
font_02_sfnt_off00010fcb.bin
454926f861d4f4e12804d18763bae1cd22a8b296690f15e2b176f7e4134c588e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 10496 bytes