Malicious PDF — malware analysis report

Static analysis result for SHA-256 6899a201c1f9552a…

MALICIOUS

PDF

89.1 KB Created: 2021-07-07 15:44:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c1f62176b6f96f136a4d350d0d1ec804 SHA-1: a8206ddcb5b20a0ea8c32941a0173f3c831826f8 SHA-256: 6899a201c1f9552aa2ae323fa989ead03087ebc05e27a0bb52e1a1affc860c15
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm, potentially to evade detection or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=cover+letter+introduction+sample PDF link annotation
    • https://oteaexpert.fr/cite_imgs/file/vejexisum.pdfIn PDF document text
    • http://szpk.hu/_user/file/wupakutuwaxavoxode.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/cb8be16b7e3a3addfb75ccae98232081/bukutaj.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc08b43962---gitekagoxuvulura.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/da438a6cc80f0f1a54b41084945e7097/koxadamoluz.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/duxolipexukofib.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/koliripunejorimir.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160730dabd52c6---kexomofutuwawarerez.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/jeduginiwu.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/06f208366745e87594de54412ab0ad06/27743198519.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69905866886.pdfIn PDF document text
    • https://marosme.ro/hirek/file/4157335825.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/fri8r2e3rnqeh0b88tfsnbo4vd/joxunexejuxekofoxokowij.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/6742212813.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/7fece617a5910921a7fc595e8d999766/dalelamopujoji.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/xifironemumisupok.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8482e8a18---23249471258.pdfIn PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/vevuzasaj.pdfIn PDF document text
    • http://zkpower.net/upload/files/21775084948.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/55110462116.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9f13d5b6af769a9d72b69b103c6a811e/bojuvagorojugexobuvora.pdfIn PDF document text
    • http://bulmarconsult.com/files/81501767945.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/627bc08af1ca83cc1529dd6c4220152d/18411714289.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_off0000f529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF529 10872 bytes
SHA-256: 6371f30ab03ede4dd7070fbb8bb08d9e38a16487c858dd326f2f681c77321d9b
font_01_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 17928 bytes
SHA-256: ccc6beb17e4739c290f03586146da6aa55c4b5ff3cb985365b216768fae98e35
font_02_sfnt_off00013d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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