Malicious PDF — malware analysis report

Static analysis result for SHA-256 154ecb02403d2719…

MALICIOUS

PDF

76.1 KB Created: 2021-09-17 08:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eaa5d2eb665747c1962fbcfee327cc34 SHA-1: e730e83cd36564c1e94d134355734a69445f3152 SHA-256: 154ecb02403d2719a6c398498a8a05bf418bdaf87986e76619ec01acefdcbc9e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves luring users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139d19d8950a---99085062738.pdf In PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed4a516980---sinuzelur.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/xewen.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/77369909107.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/vonoxomizu.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/ratuvefadexokoninex.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/38697511270.pdfIn PDF document text
    • http://alsace.annuaire-regional.com/ckfinder/userfiles/files/mosomaposuxiji.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/fekomogidutez.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/wuwulazafiwonamu.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/97484262208.pdfIn PDF document text
    • http://weldingplaza.com/files/file/84257325637.pdfIn PDF document text
    • http://opersan.com/file/81468584428.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021091521482914.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/54897757265.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/suzererixelowavu.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210912040320.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/debizijonesezejebuza.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4944c40d5a5c97146fa728b484a9757a/82160015669.pdfIn PDF document text
    • https://salonrewards.ca/images/file/boxabajufuxama.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/31180751957.pdfIn PDF document text
    • http://keralatravelpath.com/uploads/file/25270219565.pdfIn PDF document text
    • http://alkanboya.com/files/file///48632331042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=video+mp4+youtube+converterPDF 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_off0000c342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC342 10768 bytes
SHA-256: 20544846bc24b1e7b8ef732b2749ec14f21716650d767b0818733b615313bf3f
font_01_sfnt_off0000dbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 18164 bytes
SHA-256: 31020ead55905033ebf2f818837f3fa573bcb2b6fd5bbe159a1d564f4092dc78
font_02_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1