Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff3755a4deb7a1a…

MALICIOUS

PDF

116.1 KB Created: 2021-09-04 05:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f4a3249ac72138694e5c6c97f411434 SHA-1: da835e011eb9ff728055a56715b8514328392346 SHA-256: cff3755a4deb7a1a46cc71db95dfea5c40e878bd99f180eddee5a088448cd293
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • 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://huntic.ru/uplcv?utm_term=managers+and+leaders+are+they+different+abraham+zaleznik+pdf PDF link annotation
    • http://immobilieninvestors.de/userfiles/file/7607371504.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/fabowovafiseku.pdfPDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/95e1d492239e4456876e0d85fd5c4f9b/17658183857.pdfIn PDF document text
    • http://teaandtiarasmontreal.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/miluraga.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/91027369564.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5jcda0q8if6bfbbj4ki01eo3cu/90025584765.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/92442336506.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608103ab5b374---fipuputavuzejewiruvimelil.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/bf4b2f3778553c89756ffb7196a76434/zevizonabi.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1aa411b720---47235244017.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/39596002135.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/wolakomoliv.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/gefikivodilofawutakomug.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26590462443.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/80054921131.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/91491156834.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcf97b44d---newowivepexurajegoxa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/4d32a8bbc5c12ed62e7f1891f15a12ee/gugokifanevonewuguja.pdfIn PDF document text
    • http://masonlegacy.org/clients/61515/File/wodasodarizezorirenireri.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/1755593159.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160825fcb20561---27000808357.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j08ptje9o7bael8l4nrrq28icu/26632146383.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215301418219596.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/juruvexusedutetirofor.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_off00015f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F3D 11224 bytes
SHA-256: e21113526611a68cf259814087e96ac00c34ae7f02b5d57eb4eb85f23cc28581
font_01_sfnt_off000178e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178E9 19292 bytes
SHA-256: e08d18299d3bdc8e3a1f20577a4cec619fe10a61423213dd0f5d24466dc528e0
font_02_sfnt_off0001aa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1