Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee5e5938180e750…

MALICIOUS

PDF

88.8 KB Created: 2021-06-28 20:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 946200bbdcdcff353c284003f7a2bfee SHA-1: c0f0590d19ce5a784d84f636e4f73ced34c3a603 SHA-256: aee5e5938180e750c8182893cd627b5cabd936f26b03148c83b8faf15b6d6788
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggests a link farm designed to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm characteristics indicate a likely intent to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://billsky.ee/files/file/didezonad.pdf In PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091a389d7097---webubuwunoxifitonetigu.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/3vr5ev4j7278a56r3bktrss1ma/nepaxogozanimopa.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/fumovuniwur.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/e9d7aeaa8715616a9ba48f9502aba4d8/nitijesanolekalobovumetag.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/18567486397.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/c29ip7p03n5u9j2cb6b05cshen/8184608637.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/86b83ff4f00ecdcf4ca6206f5dc69d60/vowadopuvowekine.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/kizeledowewamilula.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/83736818203.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/054f40a478d8ef362deb89e6c0404019/gamapugorisulegoxalaz.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/13c15989131a5ff204c2b88997627f1c/jenuxiwobavasawaxedogitog.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/24905390393.pdfIn PDF document text
    • http://konyaozgunmobilya.com/userfiles/file/13909814702.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/e69a8d23fa83d94d949b40e727f18890/17227275136.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/943237c9ea390a7630143673f84ae5c6/12988616512.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/ef4592c7657bcd2ff3b21c87c013fd74/13442031768.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb86704de8---97325529571.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160810f5468f13---27443521861.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160822e3dd3993---68778937194.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/fcf57b86afff8ae5a55181a060e60150/22606440825.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1511e4b361---widaneromozisezew.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9a28c9c1---14171820387.pdfIn PDF document text
    • http://fitviewer.biz/files/file/gatunokodusirunadazowuses.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/51397296432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=arachne+and+the+weaving+contestPDF 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_off0000f9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 10736 bytes
SHA-256: 54453e85946cea8ccba7d6232972b23fb6daad7fcd353e2abac4c604cb542adf
font_02_sfnt_off00012a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4C 16808 bytes
SHA-256: 765506bb3a69d988a8d35886441f637fab603b35ab72e8bf45568a141e11b429

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