Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e264dbeba21ee35…

MALICIOUS

PDF

86.5 KB Created: 2021-07-21 05:50:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2bad2ff41382d05e2be3e7faa4c0aae9 SHA-1: 45535bb4d28d76a91b1fd6d4f035bb914bd0ad1b SHA-256: 6e264dbeba21ee35c288757c05649f1851be9e4b3035babe575588eb2b1eb27d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to direct users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • 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://juhaszautovill.hu/userfiles/file/ganutok.pdf In PDF document text
    • http://dailymaydemtien.com/userfiles/files/dafewanomurixifatarezoma.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b0bd65208---24951135707.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gipisegokavafem.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/toxibidapokulija.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781919e88d9---51684589567.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/nidil.pdfIn PDF document text
    • http://cortabellanews.com/userimages/tipirodekijasakebodeliz.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ae82da1a87c---zopuvoba.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021071413103780554.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/ziduwirakenivoxaxupidimul.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f066bdf457---nilodivaxixarusutafemov.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607274903f20f---lufefisajijawexetewonafaf.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pepumopogusolujawavow.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/24721021219.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/caf5517e1f76b5a5e44a5e3d83952fa7/sululinudeg.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/59000884011.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8bfabfd4c---sofopozis.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/79776930864.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210719_AD279593E673106C.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/migabutukoretuvi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28f6b9c48c---83897016625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+to+tame+a+skeleton+horse+in+minecraftPDF link annotation
    • 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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 10772 bytes
SHA-256: 7a7814ef436252fb58fefebb07c557b2210c4cc82f8401a7be44d268f4a64733
font_01_sfnt_off000106b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 17012 bytes
SHA-256: 0764aeda582b95f2fd88f9bdee4c882e03dd0006877b40e10bea56f7e9af2130