Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d626bc3de2747b9…

MALICIOUS

PDF

72.1 KB Created: 2021-09-16 23:08:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 400d593d025d71652894de254dc6cb7c SHA-1: ecca274b4cb88ead9ebc6540db6d972d146f5ec2 SHA-256: 6d626bc3de2747b9026770b29a72d2d16564e8c61cc2f47d2ac0ce527da610cc
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://allytemp.ru/uplcv?utm_term=nagraj+all+comics+pdf+free+download PDF link annotation
    • http://revucue.com/ckfinder/userfiles/files/53742641564.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/48660309058.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/77894719483.pdfIn PDF document text
    • https://petandpuppies.com/userfiles/file/xididulubulogowivubokuja.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/74908991190.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/2cd1eb4b711d277cba85b6d00af59718/likuziwabe.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/fuwadotewok.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe75196594---ravobajasesiwere.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/konigopibogop.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-12/20210912185725211308.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/8953627767.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/44327015010.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/miwusulasanimebawikebe.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/30127875136.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/76521043057.pdfIn PDF document text
    • http://egitara.com/upfiles/files/26001862564.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/selekosemexikonazu.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/13476446415.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2b38005f0---labugi.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/56913606641.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/a42c9370t9js79bvrlu8are0o2/tugusifumigigixowifuf.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_off0000b1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A9 18688 bytes
SHA-256: 5e2fb436415153bab922e0ad0cfc4a8e2b2d06c29c376332df4a998db527c50e
font_01_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF999 11056 bytes
SHA-256: 909334b5ba749ff4047601c37fe4316beb955a9ca77c9dcd685c1e8c3a009754