Malicious PDF — malware analysis report

Static analysis result for SHA-256 92336d5b68af1d94…

MALICIOUS

PDF

76.8 KB Created: 2021-09-19 05:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d1483e1201eda05938e04b90e67321b6 SHA-1: 1a29bb76d09a1bd6ce5fd70faee9dcb84ae96d7c SHA-256: 92336d5b68af1d941322ba82197393742759cbaa9cb30c23ddb8596330e6b425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to drive traffic to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://pistant.ru/uplcv?utm_term=square+root+function+equation PDF link annotation
    • http://natalieshuff.com/uploads/file/1886006600.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/161415efa28b34---61115124385.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/taxob.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161302126ad98b---bapevajadekanoku.pdfIn PDF document text
    • http://weingut-suppan.at/files/legazolewumat.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/43678580429.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/79426264109.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/66030636771.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/motodapufijerejaj.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/walowugabalapon.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210912111910-12928875287.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/lukegusixa.pdfIn PDF document text
    • http://abyss.sk/userfiles/file/rivenakuwujosidog.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/22359887841.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/82685041797.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/57761025349.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/67082979748.pdfIn PDF document text
    • http://podushka.by/files/files/78868299837.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c96c602da4c751200c0e5bbb039c4add/79023618671.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/bobutot.pdfIn PDF document text
    • https://zbmbudomont.pl/userfiles/file/46081629848.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/08st08altk19g03a94bvsgh891/81021980489.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143be44bfc44---28738145386.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1b0ac689c---77892758720.pdfIn PDF document text
    • http://zhihepvb.com/upload/ckimg/files/202109140707161346.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_off0000c72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC72D 10436 bytes
SHA-256: 2cbb266c6c84d92cb00da454f2700ab9a77b0eda36bd02f30f12f2f2551b9376
font_01_sfnt_off0000defd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFD 18072 bytes
SHA-256: 04e35019f73406b5e275fa7ea597bda2d2ca0b621c2a7cfc8e8072b84bd58c6d
font_02_sfnt_off00010dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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