Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec2b6a1cc879382…

MALICIOUS

PDF

95.2 KB Created: 2021-09-08 11:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f120ed65d4ac679fdfb6ddcdb7b27df7 SHA-1: 87d10e0666890fc9e8818c1b3fa9baffdadfdbca SHA-256: 6ec2b6a1cc87938278739b9404fee42e8f25b5455ded416474d338e420bffdc5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded content are heavily obfuscated, but the presence of external links and the overall detection profile strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://alliusie.com/userfiles/file/gusiwibotejifisug.pdf In PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbd565a1f8---50442636232.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082ac03b448b---xesazuzujaxewat.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/39810445783.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/34969277840.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/muwojigegazivabuxamuza.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/79901656940.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/muxafufulapanu.pdfIn PDF document text
    • https://wagaskar.com/media/zoviteno.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/gufoxepixebazoxajovopam.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/43878507545.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/1843122583.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/86899508256.pdfIn PDF document text
    • http://toastwarenhuis.nl/app/webroot/files/userfiles/files/losomujalir.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/35283643988.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/65499584067.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/jedefegedijiminojiretonu.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210618_5D427E7C45F43A1E.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/54008975894.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/jomimukotevogirirefufaba.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe6f31d256---dogekikuguwenuser.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/ruwimijipadobelalubavuvag.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/wokonapevoxurelipuludiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=funciones+del+sistema+simpatico+y+parasimpatico+pdfPDF 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_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 19852 bytes
SHA-256: a7ec28f73683c0d2543c9b42ceae5e8d339fa16df0513970ee255bd1724cb4c4
font_01_sfnt_off00013d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D6E 10972 bytes
SHA-256: 8f146b28258a8b9629373cc3d12f435b4d37df0e5fd06e180b41cdca93cef769
font_02_sfnt_off000156e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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