Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fc54a8a1f274d5…

MALICIOUS

PDF

106.2 KB Created: 2021-06-15 18:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7ba92165407a46b295a17ca93f8e12a SHA-1: c0190109766d243af6acb573886e1af23b71476b SHA-256: 22fc54a8a1f274d53a935ea9b10a1d7f32eb649375ed757d465b68d37f2f833a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress upload directories and other potentially malicious sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, likely intended to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=vishwakarma+vastu+shastra+pdf
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/03353400425c701020ba8b8387550666/74972749071.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/6fd61e1983d94bcf38f43cb255681fc3/34572658812.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a80238ef9---gijoxuf.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6fecc16d---92348739716.pdf
    • http://beveragesgs.com/userfiles/file/gijujunebowulesetiga.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/i2m7j25gcr0m3u88u6ljv58uoi/63930468842.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8e6dd0d77---wutun.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a99b1dd8e10---99034400763.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd0a16f8e2---8501511176.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e2b3a1a---5992746114.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/rokrhi1p3q0s9l8vknj3ntof6b/54289923967.pdf
    • http://shreejians.com/userfiles/file/59554774324.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe31cecd---tevizebe.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608c67b99ce2f---95275737934.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/v2kvq07rigdlg4oo8sudj6c88e/85180968336.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076f1edf3253---nixuwanemipinijukepe.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off000185eb.bin
4adbbdc03ff9a2a84af657b8a626e15aebec0b2604c4cdbc305aae79672b7845
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x185EB 5752 bytes
font_00_sfnt_off0000f938.bin
8cdc5b3ffcbc7d547a05eb9bec88f82bef65b35c043aa7a6f7ab76bef36aad67
pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 5428 bytes
font_01_sfnt_off00010ba3.bin
d7df859cba5aba15fd3aa0d9095389e0629fb92aa37cc3f67d84e64a5c936816
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA3 29240 bytes
font_02_sfnt_off000149e6.bin
8ec3585157d5fae556d6063682066344dc48d5432aa3062486f64b20c99ff699
pdf-font-stream PDF embedded font (sfnt) at offset 0x149E6 11472 bytes
font_03_sfnt_off0001706c.bin
3dd0b53f07f1822199d8cd2b2d23c636de47a5f6b1ab6cd2b9eb031961429f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1706C 16192 bytes