Malicious PDF — malware analysis report

Static analysis result for SHA-256 c666b483f5d7fa55…

MALICIOUS

PDF

70.6 KB Created: 2021-09-25 16:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 778eb15b8bca5c4ba6567fec6ab669ea SHA-1: c083e92663b28206f3bdbea68286dd8197011a0f SHA-256: c666b483f5d7fa55ecef87e4088bb7ba52d10d87d4b61458d0c3e34fe8d2f0a2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and detections.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://deycaterers.com/ckfinder/userfiles/files/91184182351.pdf In PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210921/file/34971977252.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/27493029354.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad7ae89ab5---jajoza.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd9afaa03d---xikamoratebedogolulon.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/ganesesufaxizosito.pdfIn PDF document text
    • http://kahasat.cz/data/file/xerarovolaruk.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/9d8b4d96a7b8883bc179e2817f8a080a/99830039157.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142e09f81384---40308228051.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210923032726.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/foxurakipizogav.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3eb02215---mokaj.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/sijozoxajikilimikalorefa.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/26931475678.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/91279451219.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210910160611.pdfIn PDF document text
    • http://agilesolutions.in/uploads/suvopelixufizikasizuxawer.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/vufetasokubejipagix.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/talokuzododabuk.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/nafotesopiruro.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ca7b92cccbd6f9dac09062ed371957b6/30596120208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=apex+launcher+3PDF 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_off0000b0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0E9 17716 bytes
SHA-256: 255a5b309bd2c2b7c4f936dac4a6120f55a01036642dd99d06444a05dd72e0b4
font_01_sfnt_off0000de2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 10348 bytes
SHA-256: cb4ac06d482b33ce08fd6e8377fb2171c58da3ed7743f84106477850e3897561

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