Malicious PDF — malware analysis report

Static analysis result for SHA-256 723e48bec544d63d…

MALICIOUS

PDF

87.8 KB Created: 2021-09-07 17:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d063b2a7744a460b83a25ad74d7f0c4f SHA-1: 29cd45e39e9624076ed39d01bf9b303d144b4d11 SHA-256: 723e48bec544d63dca781d2e1d6a4ea75710aa32fc5124d9a9982aa94c0978c3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://patriabrno.cz/userfiles/files/75483265827.pdf In PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/30536884941.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/0f274d9b1bb1c95a420788d0a88a3aa6/zipatusakotuxafogago.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/58729187399.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/39431106628.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/dadutalix.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/20400293271.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ba17ba34792---29428756833.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/xazutazelipo.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/fipudovoluxe.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/27e17479e2836bb2353cd6fc6e6830fa/megabonikubizuxibixo.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/56494714144.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f897b3ffee---67720212861.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ada61c0d0e779c886af100ade7b0c5c6/tapeluxadonizagov.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0608b09d6a---97833712572.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/bifoz.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210521/2105210150287495720v4tenvj8rg5.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/20191027761.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/a8823552e12f3a5e50556777143fd2d2/kigudomi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609525e5ec929---67877611477.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160afe085b383a---kejafetuzipides.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=black+and+decker+mouse+sander+owner%27s+manualPDF 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_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 10704 bytes
SHA-256: a84e4088640465505d5f069477fff39d79587e31e31e55cb99ff923c696d1c58
font_01_sfnt_off000107ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FF 18760 bytes
SHA-256: 5c2cc6cc61470e85ed6355679655fb61c86bae6169f62810ee84953507de3630
font_02_sfnt_off0001392c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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