Malicious PDF — malware analysis report

Static analysis result for SHA-256 067ae5c9a143bd05…

MALICIOUS

PDF

77.7 KB Created: 2021-09-02 15:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3b0a49c1160c1b465e62994584f57aa2 SHA-1: cf75e1624bf19f2f0047d56428407ba1805f200b SHA-256: 067ae5c9a143bd056db963a43ffc3cb177781dd839a40eb108f49d08245e5011
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9976

Heuristics 6

  • 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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/mrsqcfmb473htvqib3gvapghsu/giwekan.pdf In PDF document text
    • http://dmhu.eu/uploads/uplib/file/lenilomo.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/85248543558.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/12775038157.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d7d215432c---35851674414.pdfIn PDF document text
    • http://614move.com/clients/4890/File/62680291402.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/1704937047.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/bunezujofulinedijuz.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/76107809495.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1fe43ace6---woxukubokinego.pdfIn PDF document text
    • http://guowangcable.com/d/files/lukasutuj.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbc0baff2---dagekegukemu.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210809_054319.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/82416116246.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/jomurujiser.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/3a42691cdd40a7bd4f46580640e4afa9/66575132541.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/wudanefawimelekozabirolon.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/19752789269.pdfIn PDF document text
    • http://e-district.org/userfiles/file/ladakarukumam.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/35731198286.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610a7fd58eb7c---64907323810.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/pubilatis.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a37aa0cefef---73638330303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=rajasthan+current+affairs+pdf+study+iqPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02F 20512 bytes
SHA-256: 6ef7b95b664d654086b9a032e12245ea5743ae74ce80b656886dd6251611f71f
font_01_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 11084 bytes
SHA-256: 17ad95d3e26ffd51f95364785fe4e8246e4ae7f23848a6c8e9f1bcd94b787363
font_02_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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