Malicious PDF — malware analysis report

Static analysis result for SHA-256 02ef26eec5ad7f32…

MALICIOUS

PDF

117.8 KB Created: 2021-08-02 20:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a21af000f26dc63c7e220b7d98d84573 SHA-1: 02e76761141e9f0bed8ac643b57512c8c970ff1f SHA-256: 02ef26eec5ad7f32f7f15e4bcffa41e5e65a9fa7846bb04e8ca842982e213d5f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicates maliciousness, and the structure suggests the document is designed to redirect users to external sites, potentially for SEO spam or to host further malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=can+you+create+a+character+in+dragon+ball+z+kakarot PDF link annotation
    • https://businesslife.com/content/files/97159411790.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/af85382d03f5f0cc72a3b75d27303cde/49895602821.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/gudogovelik.pdfIn PDF document text
    • http://thehonourride.com/clients/c/c2/c2a221447f3e921143a55eca482c8289/File/vuses.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/fubuterevewogavifo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/445602f3084a7203526df83d047acfae/sosibebokobozetoxux.pdfIn PDF document text
    • http://partnercable.hu/files/96549837721.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/sasifaminukofaz.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/gubewu.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/88e057a3dcb51ec6f502782f873fc023/surafifasafivuf.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090c7637cef8---21929637327.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/tonejuzewebovi.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63306af41---57841775469.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/3442795075.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981520169bd---47252977220.pdfIn PDF document text
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/18064633871.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14203657150.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbf25a12c0---19117049052.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/rumozuj.pdfIn PDF document text
    • http://a-pluset.com/userfiles/xekegifelifizopewa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AB4 3228 bytes
SHA-256: 0f8494bfacd6755ebb345573d68cd1721a8cec1b4cb31117049cfad8a2f3b874
font_01_sfnt_off000167e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FFE 11020 bytes
SHA-256: e00891553e17a1aa175f1f8b5ccc486f5886ba79a48d07d6d845ea145c08b65b
font_03_sfnt_off0001995f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1995F 17520 bytes
SHA-256: d0d985170396e268a269d3b004f8e602d4dfa22a24a17f77c020f18d0437c7b5