Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da24f680d4c1ac8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 00:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11b4d7f3652815817daf7dec98988a0e SHA-1: 0156d4da540062741c7721cefefcfc59c5e465b4 SHA-256: 5da24f680d4c1ac8a5085165a13bbe8e699cc1acdefd785c9e1734013f876ff9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to lead the user to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tese.in/ckfinder/userfiles/files/raxuwesikil.pdf In PDF document text
    • http://mientrungland.net/uploads/image/files/giwafezoruj.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/76432865342.pdfIn PDF document text
    • http://mp-journal.com/media/file/14348977778.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109151019537879.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/91445595417.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/34289951978.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/8883684022.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/941bda4583d4d927f06fcb0cf87ec92c/92327673147.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109021047386369.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/sogeb.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/91450089742.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/xikizikemiwadavodawemi.pdfIn PDF document text
    • https://renewone.de/files/dofaruzoworaripozi.pdfIn PDF document text
    • http://spbi.cz/res/file/jeleruzatok.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/92809609268.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/f6lf381qk46c2mj1sfbd2e76tm/79641107618.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/puzezibobanolezorok.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/ziwikikefev.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/mafopezuseb.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/munaxeroz.pdfIn PDF document text
    • http://ig-einheitsloks.de/medien/file/77045725615.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/sonitarumapenusa.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/66917574861.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16142896c5dab1---pasozapekuzisalanuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dragon+ball+z+tenkaichi+3+romPDF 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_off0000caed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAED 16972 bytes
SHA-256: b72a7be69dd4d7a45de179163cc7b183abe894e15f6916c05253bd4094257375
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 10972 bytes
SHA-256: 78b7324253e792e3c5cf3c753a95661cb3b41a4ce7656d00b912875672628c3a

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