Malicious PDF — malware analysis report

Static analysis result for SHA-256 949c4cdcb9718f20…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 00:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3925c7392a0eee3fe02514476e3ca7d9 SHA-1: f9cef7a2a59893f39cb4924e811377358365f856 SHA-256: 949c4cdcb9718f20c885a94e9a51484cf800679b5bc05256af6538aea33c9ac0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Multiple heuristics point to the PDF being a link farm, directing users to various compromised or disposable hosting sites. The embedded URLs, such as 'https://laborke.ru/uplcv?utm_term=board+of+directors+meeting+minutes+pdf', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://laborke.ru/uplcv?utm_term=board+of+directors+meeting+minutes+pdf PDF link annotation
    • http://pekingtogo.com/uploads/files/4310724070.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//milupagew.pdfIn PDF document text
    • http://shs1977reunion.com/clients/41590/File/xaxudigunaz.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/nhqlg0u2mpidlhtdgsqq6aq914/5803263803.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f19e32bd8---tixixarekime.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/35879758132.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/84578701895.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/digagugugakizagi.pdfIn PDF document text
    • http://poultech.net/d/files/3949975159.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/33595940233.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718949c666f---22143537600.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210608011845_iclxo2.pdfIn PDF document text
    • https://activepymes.com/pub/file/10127510442.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/12081323640.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/301427484533.pdfIn PDF document text
    • https://sanidom.pl/img/file/zisidarujetopozavumot.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/gibuxapomu.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/76462907781.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/55090841078.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98a05469b0---tigijurenekozerazozalusa.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/b2f36fb3ef9fecf69c0574b0e15f3cad/woxumevogabibeluz.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/30543217974.pdfIn PDF document text
    • https://dm288.rs/slicice/file/39218910596.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_off0000cecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECF 16748 bytes
SHA-256: 3b46281852cd87912242909440880651321d8043c0a50d26220b5d14f4748dfe
font_01_sfnt_off0000f98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 11072 bytes
SHA-256: f157bb2ee781823319816302a778b27048fe6ff20acb8b4fd51efc0ba6956065

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