Malicious PDF — malware analysis report

Static analysis result for SHA-256 acdd85a7632a1334…

MALICIOUS

PDF

82.2 KB Created: 2021-09-18 14:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6678f3bdd238f2e09f6d567b31b0d61 SHA-1: b37f6c5e130ba9a22c0326a8358ef63000e783ff SHA-256: acdd85a7632a13340b27e7f28c56f4623a1dd42d14a7f22ebc4e8cbc4318ff93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The presence of an embedded JavaScript stream further supports the potential for malicious activity, likely involving redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://vngo-cc.vn/cooker/public/files/roremotusowajitejimofoki.pdf In PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/pomukupunile.pdfIn PDF document text
    • https://arerp.kr/data/file///39849718904.pdfIn PDF document text
    • http://honeycontacts.com/uploades/userfiles/file/81667655491.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/zivodifedefexasofuzapi.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/gewuludubupifabijanu.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/favidijusemulazorijadis.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/kexufaxadadajegan.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/62549662260.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/wipugovazumujunipub.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/5367917564.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/foperezimoxut.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/fifagemifadesowisagobawe.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/rufodejakafi.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/jubageputusoza.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bkv8rb6i9obuungd7idp8c76e9/gudisavepomenewugen.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/zizobaferedijapiwibibe.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/popanolexupodotu.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/1084978949.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/jarobuwifipasuzobiralo.pdfIn PDF document text
    • http://beeshark.ro/app/webroot/files/userfiles/files/65268213273.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431cebe9519---gegepifivev.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b18a82a67cddfb894af1c196184a9568/mugimuvowib.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/39971660971.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/82850105294.pdfIn PDF document text
    • http://isemya.by/modules/ariol/static/ariol/ckfinder/files/25908406489.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13801472425.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/45070510577.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+disable+sim+toolkitPDF 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_off0000db48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF35F 10624 bytes
SHA-256: 21908220bb274833cfb3de5d61aa49f12b259a2bc5a48eceab6a1df8737d7ff3
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 18016 bytes
SHA-256: 2100db9ed7a6890ce14b675b79034425466e3359b21afde6572643d5990c2843

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