Malicious PDF — malware analysis report

Static analysis result for SHA-256 01be77d886f7702c…

MALICIOUS

PDF

94.4 KB Created: 2021-07-02 16:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 5efb1678b0a2da2020fa3d5dab040257 SHA-1: 2f3db335b777b2f46cb934491e74f01368cb7f99 SHA-256: 01be77d886f7702ce2828c407b9379a67779c6b9bdf6f26ac90c7d053b6927c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm and the presence of external URIs point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://nomylo.ru/uplcv?utm_term=decile+meaning+in+telugu PDF link annotation
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tumrvt41g3akq6ejo65qufpis7/goled.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e13ce4dc---tuvenekidoxezeguzofazes.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60cd50195---jozirofobadibijut.pdfIn PDF document text
    • https://langumeistras.lt/i/File/mugogukorujawigenud.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qplsmfveb74kbhlfi3q4555rf7/83019833496.pdfIn PDF document text
    • https://adreshosting.com/calisma2/files/uploads/46344540479.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/715e52fd9da04eaf4fe538b452d85c3a/pizutega.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/d596b0c444ccee215293ef6d42e37d10/7861177434.pdfIn PDF document text
    • https://btegypt.comfile/lexetogefirugo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e87e917cd---vaguf.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bded5d2e31c.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c4d18b023---dewekonazan.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/fufafulezo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6ece36a0---radinuvarijegekexoga.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/8901943846.pdfIn PDF document text
    • https://landi-bg.com/images/file/57574395909.pdfIn PDF document text
    • https://ratco-hardware.com/Ups/files/puwuninoxanenafesajese.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/vukozerurin.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430181800803664.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/vekagapop.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/32964540193.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/9e5e117f662f27eae74a491063fa88c8/zasuw.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072b9cf91d14---91673201320.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/44645261100.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/tirurulijopudorenedogod.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d011b99da---nijanidilasulobomiwoxis.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B7 10284 bytes
SHA-256: 8c508a1aa13f25c5e283b68df7e4e53bb53b5187b776dab93313f9934abbb518
font_01_sfnt_off00010dd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EA 16376 bytes
SHA-256: 68cb62266ed6bd64780ccb54a6d2c00a91828698cc45172d20f3dfd3a31983cb
font_03_sfnt_off00013c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C53 17480 bytes
SHA-256: d85ad16b0faa310f7abefed105d6851aacd5a282bc0b54d2c2ce749b631fc948