Malicious PDF — malware analysis report

Static analysis result for SHA-256 314ca23c19712b76…

MALICIOUS

PDF

81.0 KB Created: 2021-09-22 19:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a7d7f0da778e6582f12e104aeb54da6 SHA-1: 4172596c488713a45250217f737badc69fb92d39 SHA-256: 314ca23c19712b76568c245bc7e2c2bf54e35330ba56457741f2a445d3d2b275
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.004 Mark-of-the-Web Bypass

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The heuristic 'SE_SECURITY_BYPASS' suggests the document instructs the user to disable security software, a common tactic to prevent detection of subsequent malicious actions. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt, likely involving a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/154971910f377f16819be75a2bf24725/34988525381.pdf In PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/79551124300.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/bexikejubovuwab.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/39625045669.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/nawodazejajezamaseba.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/91589608347.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/65213778161.pdfIn PDF document text
    • https://777mto.info/contents/files/wemozumaxifam.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/dekuvijesofiwonoligegul.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/wijosonor.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/161373b5a8d6f3---78162658249.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4e3449abb34fb9fdf19d706d77df95df/74167769157.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/71811219667.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/56275106015.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/xeberibukanuxigeduxavu.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/rolejaveduzoxoj.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/gojozabanagox.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/41633059011.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/22486463420.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141eda5014a1---93212403753.pdfIn PDF document text
    • https://mmoxx.mn/userfiles/files/zedatuzewenuromuxuniz.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/88877320030.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/94561984457.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/genoz.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/nilopivizixevobawukawejut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=shogun+2+cheatsPDF 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_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 10568 bytes
SHA-256: bd3a1eb6ddb42a92b0a9151e29807d915efd3e3f7b47f7290420aa5c773afaea
font_01_sfnt_off0000ee57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 18440 bytes
SHA-256: 9a0572957d094db700c6f538456ae29139ca57c8769f33340ca2e328e6b79f98