Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bbcc344d9e10957…

MALICIOUS

PDF

71.6 KB Created: 2021-10-01 06:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5970a82b53e3103ebf0c74443a352a12 SHA-1: fd35bbac839f5ac38ca5953abd7961dafbb53ea3 SHA-256: 8bbcc344d9e10957cfcf4dd3633ec16bcc58f3f6e2c74540e157a2f3089bcb8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to domains identified as disposable hosting or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The presence of multiple PDF link farm heuristics confirms the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://cf2sc.cn/userfiles/file/92638759640.pdf In PDF document text
    • http://lmtechsolution.com/userfiles/wokubafopu.pdfIn PDF document text
    • https://maisonforville.be/documents/file/rijebofisiwetuzufeb.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/pilorum.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/nokifix.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/pudomadobazakonaxes.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/vudavitekumawo.pdfIn PDF document text
    • http://enslev-anlaegsservice.dk/userfiles/file/magepidozegixifid.pdfIn PDF document text
    • http://imi.vc/upload/files/vozilotajotanoz.pdfIn PDF document text
    • http://acril.ru/ufiles/files/87581107005.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3dd2329f003b4aa132ca698c4f528c2d/sulifopiwej.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131092a25828---nixodidomebukalom.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/80784522577.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/79916620097.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/sanofevokod.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/wagakikafemobekada.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615245389dfae---7788368884.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zizuzamilovadasanu.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/kuforenalada.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/6919331734.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/weseropaso.pdfIn PDF document text
    • http://unionasset.net/file_upload/spaw_upload/file/20210929063525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+disaster+artist+full+movie+free+downloadPDF 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_off0000b313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 10832 bytes
SHA-256: 31506af614b2aeba9ad49b1dd8a79867b89619ea0c75f3dc79660478df6c21df
font_01_sfnt_off0000cbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF0 16868 bytes
SHA-256: 70a6a76221ec96243d1000294fde1263a5f799c555e5da0b279537416fd707c0
font_02_sfnt_off0000f68f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1