Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2579d2e6b087c7f…

MALICIOUS

PDF

71.1 KB Created: 2021-09-12 12:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7fd38e05bdbe44a208c683cf11184be SHA-1: df1b65fb00a09ef6dcee96cc0264f91b87eb5049 SHA-256: c2579d2e6b087c7fd9ad0c475bbb47ea33a08ad19eb4ffeab2b4a7ddd64757ba
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 links to external websites, some hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern focused on redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://bloomeng.com/uploads/64478860118.pdf In PDF document text
    • https://mangallagn.com/images/file/73835101578.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d160ea0f71---gulofelosakesidimirofez.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136628ac1c5d---libupuwixuvoxubokutiz.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/zafuxim.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/bolufiposed.pdfIn PDF document text
    • http://xtra360.net/campannas/file/sadubuwuzesaripajak.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/vcotj16m9di71cq195ubs22377/19275497812.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/50208264014.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/nonarapasisajifubama.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132635664ccc---gubuxofuxa.pdfIn PDF document text
    • http://lpkgoodframeupvc.com/userfiles/files/98638359523.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/17503984193.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/wumuxekevutinipigajigogo.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/13179561154.pdfIn PDF document text
    • http://synphabase.ch/upload/file/pijasijumofaxuj.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/zowufamoraw.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/kidadurazejex.pdfIn PDF document text
    • http://haphadoor.com/upload/files/zoruzeseruretazifadimeno.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/35120344574.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae4aa5856---80130345397.pdfIn PDF document text
    • http://abwva.com/uploads/files/14800600621.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/bumumebezep.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/71204190581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=where+to+download+anime+movies+for+freePDF 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_off0000b6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DB 15508 bytes
SHA-256: c5b0f638c5aa079011b371fde2ea73acb83c40f4552f24ab6e27a1b9dadf4567
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10764 bytes
SHA-256: cbebe8e72e23e3188a31ff1ef335257474a30d3baa804e6480c2f9dd7760e3a7
font_02_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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