Malicious PDF — malware analysis report

Static analysis result for SHA-256 86822fe36e3031fd…

MALICIOUS

PDF

70.5 KB Created: 2021-10-01 13:22:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: da08b5684f7365250d1ffa3ae7afdbd6 SHA-1: dd2fc296afacb53b87c6f03a83cc9c97feabfd91 SHA-256: 86822fe36e3031fd4eb34e1b6acb5d468192e4d59d3d1ce92453325a6f1bbf83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a common phishing lure, often delivered via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=inspeccion+de+calidad+pdf PDF link annotation
    • http://finchamauto.com/pics/38696262934.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/42468046473.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c154b5471a---60799695746.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/wakefodedatujafi.pdfIn PDF document text
    • http://gibisch.biz/files/files/83224134624.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/96650395736.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/vojaxovabitera.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382616e83f0---95771812167.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/30358364364.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/pazadufeligivalisir.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/tukojuf.pdfIn PDF document text
    • https://agros.net/uploads/file/42776910126.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/74680299041.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/dinuwomuvewa.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/digoduxepuxugal.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021092422002727.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/85543227376.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/a63pss08kqld9oja6539do5695/71055245417.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/zuxijixuvomenepoda.pdfIn PDF document text
    • https://mobiligennari.com/userfiles/file/lobolukojel.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/70506679762.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/kejikifuxujikujovew.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/bolebusebonidusi.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_off0000b301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB301 10368 bytes
SHA-256: 05b0d15f338fd5381563625a6fcce8e8417f11e775f8c1f0a1289d8b9cfc9c08
font_01_sfnt_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE290 16716 bytes
SHA-256: b384c159584a178725102f9b8ab3b33204d68cc85a7e6b35db80582cdab566f5