Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf9faa71807858be…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 16:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3fcd9fd71f89c6eef9c385fba4cd6afd SHA-1: a6266c302fe493910a251d44169b7b9dfcbfd0ec SHA-256: bf9faa71807858be115581a0cdf79e14582fd1930b81f26e96847ebba641ff31
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of a 'download' button lure further supports the intent to trick users into downloading a payload. ClamAV detection and ML classification strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/uplcv?utm_term=independent+grocery+pick+up PDF link annotation
    • http://bangtutrang.com/upload/files/lanegifaliwadelinut.pdfIn PDF document text
    • http://axwelindia.com/uploads/66939963420.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/42943742491.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3iolq6p9fpl9cs5tohvm1cgob3/19678654796.pdfIn PDF document text
    • http://fitviewer.biz/files/file/fomobonezorunirejoluzup.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/97631328500.pdfIn PDF document text
    • https://orrizon.ru/images/file/45202101528.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/guviruborejovupurute.pdfIn PDF document text
    • http://wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fatiripexadakul.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/vttke60j9k0dor8l5rl14cq46n/libozegabojovakafediw.pdfIn PDF document text
    • http://apvn.info/userfiles/file/90364586014.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/cf9682ac001b892a2c7be5ec1f385d4d/63250214149.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/64602146c0d06760b931977233b677f0/remobarudijofevoxirewu.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/98602268575.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f22ddb515ee---91350314252.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/tasenuxuduzogegawiravi.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac4b653351---68505691954.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///30025123382.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/6bf80fcae12ee7ef66707b792f25a22d/85905068456.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///52615810484.pdfIn PDF document text
    • http://ndt-ultratech.com/files/9587060875.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/fojixin.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_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 10572 bytes
SHA-256: 98388605110f61c787f7fcd4890f31163e3bf31aafb8648702b4c6b49cf51104
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 18556 bytes
SHA-256: d8c5d0c06ae708560d6b99c940815e82ed239d7e39d80f3c9ba4a2c1f99ca244
font_02_sfnt_off00011eed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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