Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc60ece3eb9c1bab…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 03:28:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fbdccd689bcbdc11bd62f70fdc186100 SHA-1: 8df495abde186d462f8aaff854bee948f507fb97 SHA-256: fc60ece3eb9c1bab0baa8487d0b24565e41e912ffed84f6130b324d91c9d4e53
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, and includes a visual download button lure. The presence of multiple external URIs and a link farm structure suggests an attempt to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--or3bo5mvlb.com/data/editor/file/33444818504.pdf In PDF document text
    • http://murzilka.biz/images/uploads/file/32595815725.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/96047022103.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/76750746535.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/voditojituvipumoxula.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fd8e06064d4aa4566ad88dd243fc4348/99636240684.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/pivamixemosot.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/takagof.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/25838236444.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/sataginowovorisiborogo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131dd713bd65---27900745964.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/rawevofuvuwavelugab.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/nanipamoligidigefisadarer.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306942581ba---9641595082.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/bubetodifegazu.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/50338560770.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/pulifopelubanoziten.pdfIn PDF document text
    • http://techmechengineers.com/uploads/mivubijag.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/17815005198.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/47145091300.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/wofipes.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/mufuvabikujiviwawuni.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/giwijilami.pdfIn PDF document text
    • https://agri-mal.pl/userfiles/file/riwofetevowanag.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/34758477337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=keep+safe+apk+download+for+pcPDF 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF291 18280 bytes
SHA-256: 1e2043f695af65ddbf14ec11616ab6e587658c74f843c19f9c1467971d04cff0
font_02_sfnt_off0001214e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214E 10592 bytes
SHA-256: 3a2f1378c43f45705db6541155344fd8312e3e410c9ae5b6ee3cef367b13e28b

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