Malicious PDF — malware analysis report

Static analysis result for SHA-256 1566cc90f6bdb69a…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 17:33:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 513b9403409601ff53dae6424fb8dee2 SHA-1: 5e05574a52039241dac9abca8b1a6a6972ed20ef SHA-256: 1566cc90f6bdb69a96c245a34b3244ce76083dda1334ff11cf72554f57e596d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous URLs, many pointing to compromised WordPress sites, and one external URI to 'pixomot.ru'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host many links on disposable hosting, likely to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure and URL analysis point to a malicious phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=best+android+features+not+on+iphone PDF link annotation
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134a6c4df74f---15351914936.pdfIn PDF document text
    • https://alutat.com/data/file/27061189363.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/nadijitawifokigevizope.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210903030133.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc30c092d---45598600543.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/10584737091.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/56929909329.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/39310129634.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/fifotewuvo.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/5841656217.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/dipigak.pdfIn PDF document text
    • http://wsm.hk/images/files/57350339264.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/gewineroda.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/64825530008.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/79887501327.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109062123211362.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/750bc9a94387e9feae81854336d20e25/gabisu.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/zodagixaf.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/suwemupoxowililiteru.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/totupasavusa.pdfIn PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210913170456.pdfIn PDF document text
    • https://parc-hotel.info/file/xixorav.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/10427560338.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/74674091547.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_off0000f020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF020 17360 bytes
SHA-256: d493b9b8b148d6876d52ed251f49a7198633949c2edfe56e7dc81c4007991622
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 10704 bytes
SHA-256: fc6c11a9593861c437887dfa26b9367eed82ff9c2d779638bd58c68443c31e31
font_02_sfnt_off00013576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1