Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1429508f7b6e4a…

MALICIOUS

PDF

89.1 KB Created: 2021-08-09 07:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9ce96f32b1c4afbc576b48b87a0aa835 SHA-1: f33eb2c5d0646a3301391fffa4f042358af870ea SHA-256: ee1429508f7b6e4a4359785d96116fb6e0f083982b25f92aa01444184f630418
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on various domains, some of which appear to be compromised CMS upload directories. The presence of a 'download button' lure suggests an attempt to trick the user into clicking these links. While no scripts were directly extracted, the overall structure and the nature of the URLs indicate a malicious workflow, likely for SEO spam or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://tw-go.org/files/42283912727.pdf In PDF document text
    • http://clingac.com/d/files/zubugejewakesoxadosedowu.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d336f0a2d0f145eaebfe9f491ef5204b/76049083495.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/43007048042.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/dec4857c803e06dfc9a0eb293eac5105/37993743082.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/62098733351.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/52912404220.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2ac23d5a424e00d761562cb1f055c626/3444534273.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/vogozakegamosuvojilo.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088577e8da7e---74772273209.pdfIn PDF document text
    • http://bbu.vn/Images_upload/files/63647674489.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/99055074496.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/f93v45jpn2buqbei285u39j2g2/rubibopejijovixip.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5b7hgrr3s8qinjcor80tgee336/96901735738.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/e428i20nuiaim4a9bi0v0qal80/bowulefi.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/fusuxoj.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c16729e2ea1---50041226320.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/mipukegunoborakowe.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/dozug.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/bidozovodojiduwijifanur.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/90f14a057c161385c5046f8b10057449/juvovatepenapa.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/99724765335.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff412556cf---66553519285.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/26499571797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=programming+in+ansi+c+by+balaguruswamy+8th+editionPDF 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_off0000f176.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF176 18156 bytes
SHA-256: 38794564815cff5187cf3c34b50bf60a013f801e86a852e849c946b986d61d9c
font_01_sfnt_off00012129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13940 11468 bytes
SHA-256: 3b38a4df43c21f6f010f928d6ee36d691372b3ee2e3da858a8ed1492fb4ebc25

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