Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a87a0bd7478f37a…

MALICIOUS

PDF

91.8 KB Created: 2021-09-07 13:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b56dd3c18634416b9f5ad2def5a31edb SHA-1: a19ccb9b5643c1f0412ce0b7cb5dcb719de0cbc7 SHA-256: 1a87a0bd7478f37a8a736175c038b73ff35e7d8acae493b84618990bd6296203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://crysiq.ru/uplcv?utm_term=possessive+adjective+and+possessive+pronoun+worksheets PDF link annotation
    • http://balbu.hu/uploads/news/file/fivobov.pdfIn PDF document text
    • https://newline-eg.com/userfiles/file/89570789139.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/4700610033.pdfIn PDF document text
    • http://jngf.cn/files/file/52980325830.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/49314887038.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0d0f2311---tumaw.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/futisiwoxufezosi.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/c51327d1fe92f2ffc6f33e7b4babb757/zegorigojazexi.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/povuwadipudilunafir.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/wesenebapuligamimanedola.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/67174842055.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/cbc93acb15a49b79015ac6182eeb9b4b/77777237342.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160b01b60476fe---jexokoxigezufimagiwajite.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/1b17fbc1f41c66bb00678f97399d5c54/mesekugiwaxoxerazula.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/44509503252.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/kimetegebimiw.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/94665292860f6ae5385a79.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/da6a011fe1e7f34a0770a54ec0a0c146/25503967551.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/08dh6i7t1gul3u3ahcfqk7vfpl/51760334773.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3785c8a1b---mifomakebiduvamapok.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bcc6bdcbb---fekogo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f116873dc1085bc17eb688cd344402a1/53644171477.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d4fa026c74ea0655fb9872cc00cc2457/wotixegufen.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_off0000fc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC08 19304 bytes
SHA-256: 8f1fba232b73007f95b726ce04e3571b5b7ef96f1f7747330574b67825f8243f
font_01_sfnt_off00012dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD2 11040 bytes
SHA-256: 3e1cd962574405ec4ee4613e30c2098a9cbc0295277cd9257a39d3095fd66754
font_02_sfnt_off0001478c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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