Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68dc01aa87dbd9f…

MALICIOUS

PDF

81.5 KB Created: 2021-09-09 12:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a648573666b6f022818b4da344f78a5a SHA-1: 00922f3a540fff3e90efa38a8fd94e2dc2066651 SHA-256: c68dc01aa87dbd9f4e57211b672b6dc7c88bc82cc1339d20fea0ec398ae7c3c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. The presence of numerous links, some with 'utm_term' parameters suggesting search engine optimization tactics, points towards an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jfac.kr/ckfinder/userfiles/files/10695944356.pdf In PDF document text
    • https://kurek-rowery.pl/user_pict/file/45455884556.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/17779221695.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e1ff1491e3d8bae5df9b83dca2a58fd/zonifiwozujanaw.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/76692915357.pdfIn PDF document text
    • https://olterus.org/contents/files/nemuvida.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/80f429e22e13efa6421a7f35e257b1fa/49007871163.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/47829133211.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/365165353.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353ac77c9bb---80361415445.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/37767197207.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/79677426114.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/40ecb9052a84c30081254fe9e07422f4/tunodosuvalesidu.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/pebulegufi.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210904085616.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/90324044926.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86013400054.pdfIn PDF document text
    • https://premiersuli.hu/files/files/gitez.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/fejogosus.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/aeaf7f5a09cfcfaa7b317ea35e52f3ef.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/67211189600.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210907113414.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/79808402767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cash+app%2B%2B+apkPDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 18040 bytes
SHA-256: a72781a2eede6bd6aa0f7a40ef9c344900331ed65105ee2bffefd6cec5e74f8f
font_02_sfnt_off000123d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D1 9780 bytes
SHA-256: 31a5831afd4f69e57133c391584781dfd0150c6b3015b1b4620c575619361502