Malicious PDF — malware analysis report

Static analysis result for SHA-256 a34bd4710dbe405c…

MALICIOUS

PDF

72.0 KB Created: 2021-10-01 01:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 112af27e9994e9c9a6481b7fe5c9d85e SHA-1: e18dd299829ae86d1e9782d36e9912e2ca46829b SHA-256: a34bd4710dbe405c0a0c181d53780c04a1e6225e0a2e0e28a22f92432b250b84
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://infrive.ru/uplcv?utm_term=amagi+yukiko+persona PDF link annotation
    • http://monkey-do.net/userfiles/file/57415303215.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/25847216111.pdfIn PDF document text
    • https://artbynela.com/uploads/file/tofebavavesemela.pdfIn PDF document text
    • http://egitara.com/upfiles/files/zezubufikobebizinovit.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/82939339762.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/2bc13af22b677fcbb706c008578a0581/forisevorutelababevozofe.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/womesewi.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/jevenalabuduturulasinibez.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202109202232484991.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/mabevunomumomozekewuzuriv.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/58484356131.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/c0387a6125b6e923801cbdd1782abecf/97752029462.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/19272776695.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/95351908214.pdfIn PDF document text
    • http://puisan.ru/uploads/file/90429836201.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/dijubikotivu.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210907033215.pdfIn PDF document text
    • http://tfforming.ru/d/files/62055910362.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/39445935939.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/7550000234.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/mufar.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/65380140897.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/65680694624.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155dc0251c7f---99169944730.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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 18412 bytes
SHA-256: 8a15fc348cb6da538417320e428be11d5045124fd29a188a79ff99e80728511d
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F6 10740 bytes
SHA-256: 412fa5fd4985a0eea95aba9ed81ed97c2201c4f7026106a1f31f6a1a59b4baa8

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