Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef9f6daabbad2b4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 05:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1b691cd162806832a728b817c3b7cdad SHA-1: c30383314cb703e8ae64d0702794299bd6179030 SHA-256: 0ef9f6daabbad2b4fec078e4e3bbcf69627c9cb5f2a61e816b05edcc7fb7fc24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. While no executable scripts were extracted, the structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://jezirka-biobazeny.cz/UserFiles/File/55116497102.pdf In PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/161303008cf120---minowixixetiposiki.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/nedadekoxigaxu.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210906/files/20210906033441.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0872346001631137591.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/94587202940.pdfIn PDF document text
    • http://podarox.ru/public/files/98161094806.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89faaa943---fukegepiwezibedinepu.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/1707420733.pdfIn PDF document text
    • http://aspbae.org/userfiles/file/xipidibek.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/11956531183.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/vegudesepeweweve.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130465d3ac56---fulajefafafomarexonul.pdfIn PDF document text
    • http://3sdent.com/upload/files/46226299023.pdfIn PDF document text
    • https://emenu.hu/editor_up/tatilujamatepoweju.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/99034714224.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/24082671826.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109040926075308.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/sezelewejokupegixefujavaz.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/11638871050.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/74021509014.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/pedalaxamaradari.pdfIn PDF document text
    • http://stl-hk.net/userfiles/86787454262.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/92743136991.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/12206406638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=viva+video+download+apkPDF 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_off0000da55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 18096 bytes
SHA-256: a9e1408876ecc411cf9e5dcf90cd77485bc78e3a84e1ade8a43cb99d556838ba
font_01_sfnt_off000109bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109BC 10232 bytes
SHA-256: dff23d08b8f7699d49d71806ce2492afa36f91f9f767444e1b6b04f3cad51891
font_02_sfnt_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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