Malicious PDF — malware analysis report

Static analysis result for SHA-256 923ba5365bdf3f7f…

MALICIOUS

PDF

95.5 KB Created: 2021-09-04 10:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec2aaf66fe5c2b70f315ba0d293cd3b7 SHA-1: ae48375aa103776cbac74f7fa808c6fbee165953 SHA-256: 923ba5365bdf3f7ff91945b9befafe4d2728661036480b3660ffe4af60123066
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves exploiting user trust through a malicious document, likely leading to a phishing site or further malware download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606d647ed377a---vuxiwosofewekerabokitiz.pdf In PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c975e69ef0---jujezumavizuvusa.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms/images/file/tiwopabenosofidej.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/nunajegevuxes.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/mozedaxolifij.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e104f3b20---gezodonera.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/bujamarijeris.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/36998137439.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/bhk7cjbg04jc27je9pi8k23fqb/gerinar.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l81nsi19gufd87kt49tro6d7vq/rupafubexufakomovozari.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/xegap.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/gesapuvomabolefapuwiv.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/2181754295.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/7eb09630d976fad0007504e38b9ab98e/zafizuwa.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/kckvbolpg676tri0j1ru2i2q9d/mopakopezigojalopuda.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/77463548321.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7os96oe1t0dbm2p8nepbe0cl07/gawux.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/0e5dd4631afa3c925a991aaa0231d4ea/18513411541.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/14145733580.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/wimasamaxopelapegewibumaz.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///98233749262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=histeroscopia+quir%C3%BArgica+pdfPDF link annotation
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/bazutuxuxowifiwagivule.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_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 20076 bytes
SHA-256: 517256354d90be9ba43ef4cf423b223d269dd354d92d55b0ba3398d2cf4fbd1f
font_01_sfnt_off00013d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15564 11000 bytes
SHA-256: da6409a0b08a343f97934e8fbd958214b929f79e21b0bf02d1ffbbbc7f3570b9

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