Malicious PDF — malware analysis report

Static analysis result for SHA-256 4813e0ea8bd2e3f4…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 23:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3c966ca4b06db6ccff275cd79b64db03 SHA-1: 5694baeacf856e05a041cee2d7a696bbcb75a1e0 SHA-256: 4813e0ea8bd2e3f47415757b2124bb7606170b09d9fb6d7519f7c8c7a0706d58
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute further malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://iwistw.com/upload/files/3695812526.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d94d9a2172---kovaxev.pdf
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/7177589124.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bccb9782f50---2967234682.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/5fd280767a8bbc021c5dcca50d18be2b/jazituguv.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee19523b24---putos.pdf
    • http://teraval.cz/res/file/jiribakagebasudaduli.pdf
    • http://brmhn.com/userfiles/file/20210529004747_228r7r.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086add01261f---21659564214.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/ce4d8945d704475eef3f0ae3e645836e/71504979242.pdf
    • http://occahomesearch.com/userfiles/files/23959092879.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781683396c---gukizenaj.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/livewivesasawavaxexezano.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aceea9393fa---11578474803.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba129b9e0b2---wekozosulonuforugufik.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/dj4sdil3ms5pq98mdj05apr8qu/mizejizap.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d112937653dc950cb1a68995de814824/14174104978.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/44f62a034544f5cdd93db48b87faa539/98533682149.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b147fd9732f---7817351053.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160798e1506ba9---49697162513.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/83765c2f21ad2933ca9703a239973804/bixalexemotifegezoz.pdf
    • http://bi-acaovo.com/upload/files/wegiviforuvaxekus.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160860966a8293---texiwabo.pdf
    • http://allprintusa.com/admin/images/file/mijaroveravudavugebibes.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9b8d32f067502dece33e5b8b6832e02a/56906148301.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=convert+pdf+to+word+gmail
    • 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_off0000f056.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF056 16792 bytes
font_01_sfnt_off0001086d.bin
280d6414ddffb38b651ce3a112e4941be5ef0ced87e7375fd2df7bdf0960aa57
pdf-font-stream PDF embedded font (sfnt) at offset 0x1086D 10856 bytes
font_02_sfnt_off00012155.bin
fd1cdec775939346b40dde803dd41d74d728bbadeb93f8110628555154cffe11
pdf-font-stream PDF embedded font (sfnt) at offset 0x12155 17148 bytes