Malicious PDF — malware analysis report

Static analysis result for SHA-256 06ff371d46725e3e…

MALICIOUS

PDF

89.4 KB Created: 2021-08-12 15:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 9d59d547b0a0857dd7bced2cb12fcec8 SHA-1: 8bc340bcda8ed19fe42e5fbc738dffe0b34de846 SHA-256: 06ff371d46725e3ed4e1efa105e68b4bd65cd50508e2b16df758678cbe6a077b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804f4a905da---sarikukorifidajizo.pdf In PDF document text
    • https://mojer.bg/files/sijamipamipurebonob.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095b734bf0ad---gafogepasaxuma.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1ba4ce79f---86492663413.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/nekawujigelebozojojati.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/795ef1589a774a1cf3cc699db0bcca33/gulutuwovademimon.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/komageruzodukazukagetotu.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/perofikoko.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/16578266205.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/u5e0er7rfv6pufc8ljvi9s6t87/14380770257.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3295ec850a0173274b82d2956b503ed8/ribunatuxunas.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/kiwotelaxiwifutoweruga.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc53b67d9df---23920052973.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/bovozawopesarimizezu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/vajigamuzirisuxamakife.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/18799609684.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/48225649612.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf9e426e43---solulegafar.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/67537487411.pdfIn PDF document text
    • https://ocw.tw/uploads/files/56054715291.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/llcja01rnrubemvlm1iavs98u1/polefuvixowejabosek.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/o2ma6uacvtrr785o4pb8p7ukig/57195584603.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wikibewutowuzop.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/kabomulupevo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07b050b64---zitoziwivi.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/97520092858.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cuanto+es+1+3%2F4+pulgadas+en+centimetroPDF link annotation
    • 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_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 11324 bytes
SHA-256: 38b716b0d3391ffdd9e5e56ad4514b32390faafba31c618a3bec3ac8802fe585
font_01_sfnt_off0001113d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001294f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1294F 18356 bytes
SHA-256: 2d37aaf8fbdb7950abafbba83d6932ace8f5fabe715479e586d99a5a4a2bd25d

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