Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dbd9041337a2c8…

MALICIOUS

PDF

88.5 KB Created: 2021-08-05 20:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b37a185d1afa2505487eed1b2410cb8 SHA-1: 824394995d0d8ec4b3988de680ae7fc834b7c96c SHA-256: a4dbd9041337a2c8a18179e629d493bc03550eaed8593dc3c24b87af18567fde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious, classifying it as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://oniceh.ru/uplcv?utm_term=how+to+get+google+team+drive PDF link annotation
    • http://www.eventoptik.de/upload/files/85490102796.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/bagomojogifaxoverafeb.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/kuvul.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/80b668ce71530b58fa8e90dccb266230/99447433143.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9e3cb15f---8626283065.pdfIn PDF document text
    • https://zzwgjx.com/d/files/12206105352.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/26124927257.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071aa667d503---temanikekiwefese.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398a5a8410---1284863618.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085d2ee7677a---rakabavanaxafesuxuwebo.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/motuvi.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1606e59fdd8c63---10079232546.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/17761447962.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/nugijo.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b92017db20---livedivejaxi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6ee45028f---41634942058.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/jebuf.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/40463707988.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/kobebipudadik.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/lubopolusugur.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f5db3fba5---94138109919.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15662d7b7---zasadezunopalokab.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/lct1qt9arjqt1o3tj3404k5tfd/64951760625.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/mizuzedusalafogojojobed.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_off0000f43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43A 17584 bytes
SHA-256: 0aba18d81dad0789cee4eaef079b22dbbad0cfd5a8c91973501ffa756bad77b4
font_01_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A60 10460 bytes
SHA-256: c0bb69bc6f4f47f850b906bfcab9a5857da155ce46af83a27c59c3d3bdc12218

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