Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a118b676c25c3c4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-18 11:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 531479093206fe5e6d2ac47c46e141f0 SHA-1: 379466a4cf081d7336a4cbade5d6b5b602d891c3 SHA-256: 0a118b676c25c3c49762cf818c81c3dfcb540ea70657d044abbe912fa13b6495
96 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the heuristics suggest the document is designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://oniceh.ru/uplcv?utm_term=apk+pokemon+sword+and+shield PDF link annotation
    • https://uzunlarpeynir.com/dursun/upload/files/japazijukajedogukejavukew.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e39rfpeo3bl99r0u1ai5rlvm07/ziropupogazoxokudawij.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161422356a2bf3---balikijemorufim.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/rufukawaropuzenoxuxiwero.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/xasowuziduvogotovojelenag.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/ladamidosimesemilibevi.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161309077ed075---22219154840.pdfIn PDF document text
    • http://trip-sale.ru/userfiles/file/32963833688.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/borazirulonu.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/26233238811.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/vugodozeduxu.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/79820771194.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/jenuradugudasawu.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/kitivomofomapawogul.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/36387018264.pdfIn PDF document text
    • https://ratosatu.com/contents/files/89947106881.pdfIn PDF document text
    • http://ukrfirework.com/images/file/28284044383.pdfIn PDF document text
    • https://beautydent.hu/editor_up/60055387581.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332c5ccfe6d---56171545141.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/91717805808.pdfIn PDF document text
    • https://duvanco.be/docs/files/68384695744.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/p7qfv98cc526rbcnebcj2lf394/2189598549.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_off0000e5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E9 18348 bytes
SHA-256: 101121d862688e48a6ac536d3d0071fc0bd1c099601883d5f9b13e100bf9232a
font_01_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7F 10716 bytes
SHA-256: a68872d8f6e01dad6ec2f2e21bd511c5db8b806b8c37e7fcafa2990716a1397b