Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf136b4bd9e5ef3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-17 18:36:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5ae40c78b6ad733a5e4d17820f20d623 SHA-1: b2590979403637ba37978121e348d9f6f4650681 SHA-256: 6cf136b4bd9e5ef305c8a09442e2af3b429751958854af64c8048ba129b8b5df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with multiple URLs pointing to compromised CMS uploads and potentially disposable hosting. The embedded URLs suggest an attempt to direct the user to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec6671913---mamikuv.pdf In PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/vuvopofetizuxole.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/nemanokesifuwenabu.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30adeb60b---78923367473.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/18029719984.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/tiwimemirupeduwoxotew.pdfIn PDF document text
    • http://decorstore.eu/upload/file/viwukefez.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373b390bbf5---liwitimudejum.pdfIn PDF document text
    • https://dzido.pl/userfiles/file/daxinulodaduniwetubes.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/86089809223.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/lowujezoli.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/90987488646.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/80166660178.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/vasid.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/59183243936.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/97340842466.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/zuniroj.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f638c36c72---78280297694.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/sanijax.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d8739458c7d642e6ab5742e27e368d93/96702017928.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/83442166931.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/41850751316.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/jubigev.pdfIn PDF document text
    • https://deepex.hu/hirek/files/14209181846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=steven+pressfield+war+of+art+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_off0000e4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFE 18524 bytes
SHA-256: b4e1584af3fb98b70244491161325f2dee38dda15f8d2e61e752922e61836003
font_02_sfnt_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 10716 bytes
SHA-256: a0cf1b574f046ef93857fc16892c91aab81164cddd302ea74d73c275bd64ca75