Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4906a524930877…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 17:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a3e22beeef9fda46695698d5f552b6d SHA-1: a13e28883490cab0a9e50e0d577b6a9d7bef6a2d SHA-256: 2e4906a52493087750953e6f45ebdc2fa69c56fb1b9641e0be55d2dc54311a2a
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to potentially compromised or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URI heuristics and link farm indicators strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ncfc.com.tr/ckfinder/userfiles/files/53714463379.pdf In PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/pegilamaxoveralesat.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/43199045709.pdfIn PDF document text
    • http://umhouses.com/uploads/files/zebiluju.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/xenadupipekulewalexejoxe.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc52c5566---47830686701.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/40193965507.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/32816489470.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/nijuloxageli.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614708f3a859c---2819463524.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/tobolitekuwexodog.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/lixasin.pdfIn PDF document text
    • http://bio-scan.com/userfiles/file/tetasaletajoxonod.pdfIn PDF document text
    • http://penzion.sarmo.cz/Images/file/44521775955.pdfIn PDF document text
    • https://restaurant-kamkok.fr/img/Data/file/75800511592.pdfIn PDF document text
    • http://dkind.net/userData/board/file/16550971491.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/dunizavolaxijoxigunubu.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/45693456288.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/lupukubezevusubatuvaxuzi.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147fc7412c6e---86697093428.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/taveruniberupafoge.pdfIn PDF document text
    • https://megashina24.ru/files/files/58585990293.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/lonekakobukel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=android+app+to+change+voice+during+callPDF 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_off0000e86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86F 10772 bytes
SHA-256: 8bf7527bf4dda05242648ee95d4e21ef682e9006122ca48f204dcdd4b7b21168
font_01_sfnt_off000100f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F4 17588 bytes
SHA-256: 3f60f1c786dd517de2af04d582a3cd8298b5e1f820f2117d5c707de357ae6005
font_02_sfnt_off00012ef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1