Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5fc61aec6be4c58…

MALICIOUS

PDF

81.7 KB Created: 2021-09-05 19:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2d56ae0d558902af213addff27ab15ca SHA-1: c8b00b7b1e636ce7bfc00106cae547945813fd8c SHA-256: b5fc61aec6be4c58c8bd8f02da909d37fe53f9e457af55a8bcc3a3910632b0b7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it is used to redirect users to malicious sites. The primary purpose appears to be facilitating phishing or malware distribution through these compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://maszyny.pl/userfiles/file/vavule.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee9267bdfc---wemolu.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7474455fc1423b3326748dbe17c93f9b/5345225721.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/lavuwolamogazibemefejaxil.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210728045147.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/8614272.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f215074666a5bbbcba2fc1a25c352dc1/wemav.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094a0ecc4395---86069757685.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/83928693027.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/varabe.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/ea6b27655f9b1c7d21f5c6c9d8a99589/88872757296.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210629/file/gifaxemixovoxojoximoj.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6d2efde6c1---92664448946.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/zetaxemiselaxogofote.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075fa1cc7cef---99473939436.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b24526d8a73---noxemerugunizitatozose.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161209ab604439---sobimepuwujaxokufajomazak.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c60fde454f---72990647831.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/817e6dc87aaf47c7739393d7c5b0d2b2/5280260275.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/75863823070.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/numujekupufigepizavagug.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/rosedifazabozadazopiluja.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f47127720b6---nogelefogomozemarumugug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=greenlam+laminates+catalogue+2018+pdfPDF link annotation
    • 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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 17540 bytes
SHA-256: a8c026a99ffae4fa03939d309cd20905c7d10097b4fe7251c6939c894339572c
font_01_sfnt_off000105ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BA 11604 bytes
SHA-256: 3b506721116b6efa57a0bfbc1e4b3e4eb42486d87cfccf4d36bb660145b5f63f
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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