Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ddc246bfb35199…

MALICIOUS

PDF

77.8 KB Created: 2021-09-19 18:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc74128e5e0fc2649f42f8bd4f9abe1c SHA-1: 2b22506c27c14c656d4486543129704dd857877e SHA-256: e5ddc246bfb3519968a1a72fd38b1f4acf7db03f058f94883a1e9dac71755e5e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised or malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, further suggesting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://autosaloncenter.com/uploads/file/65833751231.pdf In PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/miwabezilagafudaxagi.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/90948775981.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/02/file/20210902_093334_189.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/pefigifogokerafekudewe.pdfIn PDF document text
    • https://finliz.lt/i/File/vodezoxiris.pdfIn PDF document text
    • https://ventsistem-bg.com/userfiles/file/54198523296.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/wepiz.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb39539ed---92408700134.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/rozibejosukadumatoba.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210905_843433E7A9A1D436.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109051130123565.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/labifiduvexaduvukekagut.pdfIn PDF document text
    • http://deltools.com/userfiles/file/kovategikebodinoxusux.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161420c9e085fb---rebikumebajabaneteb.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/24828000750.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/27684198425.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342fd672878---22619212962.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd0d590b4---kazegalijazipekoxoxavor.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/boxuwi.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/15165566876.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/marokeporibeluminetupo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=coc+original+hack+version+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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 17460 bytes
SHA-256: 776e4ce77852ac3d479d855ef1c59ff76be712512fd42f6693b62a2fe69c636e
font_01_sfnt_off0000f8fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11111 10828 bytes
SHA-256: 4eecaf97ab52c6887006bfdb9ab64186abfa705a48b6027ee5e8562a69db891a