Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f116363d5e220d8…

MALICIOUS

PDF

87.6 KB Created: 2021-07-14 07:23:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d3942999a62fa177ae4f514487dca4a3 SHA-1: f55281c92d1f795291f911ea5014df03c18a4a53 SHA-256: 5f116363d5e220d88d4008812a8a6bbf9974c2a91a2a353a2191388759a22ea1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to potentially malicious content or phishing sites, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=musicals+like+west+side+story PDF link annotation
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/jifq5ta42ic4cgqah96r5gdjh2/12999303540.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c831b68a1e0f98e77dfaeb30f1dd84de/74032737097.pdfIn PDF document text
    • https://biocoils.com/img/file/23985476617.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/43bbe0a67e586d344657f658d2dd2d5e/39667113988.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/620287cfec3951ea405bb7fe109212b1/18428105592.pdfIn PDF document text
    • http://ashioke.com/images/library/File/libogawatekan.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/fimegivimajeb.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/5291589471.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/8984632338.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608986f5852e0---13867518734.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/tuvudev.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/lizabamavinupatobewutak.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b9e8adc9---raribavulurugaxa.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210628103337.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/34004662020.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/rimemiriwoxedatakefo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609711c8e8aa3---10911185930.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085600b4d4f5---femevapobizij.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bec8bc52d64---9355973624.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/tikimudepag.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/a17a7nivgb20vrus4m8hgg8jk6/nonejize.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/ca6ad1c2e5091ca7224a82282c5cb427/bozefezagufi.pdfIn PDF document text
    • https://lapiadinafelice.it/file/foretejajusim.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609c78a15fafb---86088947711.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_off0000f586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF586 16592 bytes
SHA-256: 13f2369b2c5081c14649dd3590c545053705b4c94bf18cdad2671da6f8b50927
font_01_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 10644 bytes
SHA-256: 17c07d8712f013ffec16ecb9a0328a003f6e0f07d8294b9064fc75b7b4fe8600

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