Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01e8233c14e6d6b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 22:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a02dac790a545ce5f7a546f8e7126edd SHA-1: f3f8bff465095baa9cdd1d34351b2ffed926ce89 SHA-256: d01e8233c14e6d6be2488d18126f00b60fd5d06af4a8df5d58387e7096fc98ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further obfuscate the malicious links or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=car+radio+premium+apk PDF link annotation
    • http://ijdssymposium.eu/upload/19470791427.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/42240549975.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/3038316348.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/tuniwobobuzu.pdfIn PDF document text
    • https://bdata.vn/upload/files/botobutifowevelifovi.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/68021756303.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/53479297204.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/59012839262.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a1570a5007c35881ba15d9b1ca771886/62702213558.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/28818902887.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/76021625370.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/visoxujapiwovagego.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/93636871624.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/425e168fa4e5c5859eae6aac278e3a92/gunidabokelid.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/34226494464.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138342bb3361---13688442806.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/35376967680.pdfIn PDF document text
    • http://xn----7sbndn5at.xn--p1ai/uploads/files/lugunuzuzaled.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gewibemidafu.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/26468757331.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/84684322501.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/fuwozabozozolakesud.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/bulamujirubalisuwa.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210927084724.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p6dg3mglrjsqj2fe6kndfr52tc/purekoxomivokekufuwaxug.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/wojefevela.pdfIn PDF document text
    • 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_off0000b93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB93D 18232 bytes
SHA-256: 4c456f59cc529d28ba002bcc12d3e0eccbd9316b4357dc5e400f2381c4a29030
font_01_sfnt_off0000e7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FF 10360 bytes
SHA-256: 2a20c97c081d2addd7a357f290ef530d76bf59675294c8e91eca96ea99713f7a
font_02_sfnt_off0000ff5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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