Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ab063fab0e47b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 05:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5c94fdf74d4a97050898009aa9456d6c SHA-1: 54d82181293750a8d923f58cc9181dfac59e9e36 SHA-256: 5d8ab063fab0e47bff9edd4b3235a8c54407863db5b195763a9ec0f29bc48800
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage and disposable hosting, indicating a phishing or credential harvesting scheme. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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 http://krukewittfarms.com/userfiles/file/91739023318.pdf In PDF document text
    • http://www.binghan.my/userfiles/file/mivupemelirubogopazugos.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/64318316060.pdfIn PDF document text
    • http://moneymaker-gold.de/files/25598430118.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/064d1e7e79adaacb090491738cedc420/16484219414.pdfIn PDF document text
    • http://wwsm-us.com/files/file/6692632547.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306c505915d---gopijupeviva.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/vobixav.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/68553782619.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/dokokazuguwetapo.pdfIn PDF document text
    • https://zahidnawaz.com/UploadedImages/image/verumusadoza.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/59265740795.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe11e82263---zizifipubojisezo.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/libudadelujumodi.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/tujajizowozexewoxilenuluj.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b38ced5587---60280002255.pdfIn PDF document text
    • https://kiptep.ru/file/94138372789.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/sekefutibaxozimok.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/28299105717.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/55990537482.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/fuzaroleniwun.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75784009276.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///82940456127.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/18908741805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=outlook+online+sign+inPDF 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_off0000daf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 17996 bytes
SHA-256: d3e6dd63afa8320565fd6ececb3e21fb5339bd5b0ed68a8b512eddd4ea117b76
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 10236 bytes
SHA-256: 28f7877261d5e32c02876c3f0790b1b6f0dcae0b2a7b7fba2725bf9ac5c7356a

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