Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6820e4621d1d8ec…

MALICIOUS

PDF

73.9 KB Created: 2021-09-05 08:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 76fd2fc4e90d5cdbdd4b484e8b783994 SHA-1: c342612548d71fdabc52efe8c5e5e1888e70eb7f SHA-256: d6820e4621d1d8ecc2aa4aff5b8104b0ea5aa2f9ab9658e84f4ec13919f1d7dc
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://krisoc.ru/uplcv?utm_term=resistance+colour+code+pdf+download PDF link annotation
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/51f0qb8lt94nouhqa04s5g3ggl/58073689872.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/68j9pjikp1m38s7gd4kkv8prj7/3174053780.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/60383447537.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/3916041238.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48fb2fc1---ribajajuzenuwabenad.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/663fc44eb3df5c6e7f7ce4ac42d51d2d/nolivag.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607747de9f565---17527993730.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/173a4d4d750681fdcf65e1497fcf1a83/46658846055.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210801_D56911598DA4DBF9.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/zesepikupexowetagugo.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/65689475008.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/69056999192.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/8447052317.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b4fd663bf---nagajo.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/98183630821.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87efbe24a7---sisam.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff084c55e---68271765306.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/32878228128.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/mabumorunililasewaw.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210805_054748.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/degizavovebapakomupetepip.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_off0000bd37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD37 16884 bytes
SHA-256: 5d5b44162d09809ca4265260bf9b65744467724bd55e2fcd701988b0d7f8352b
font_01_sfnt_off0000e908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001011f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011F 10844 bytes
SHA-256: ae8e266b3d9e5a9a4bbb1582066aa595df4ddac3751acf7e13bf17c98eae521b

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