Malicious PDF — malware analysis report

Static analysis result for SHA-256 e72f98795e775fef…

MALICIOUS

PDF

85.9 KB Created: 2021-09-19 04:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5194755398605fd9b29b7c25447de588 SHA-1: 2ff3d006065fd2bf939fbe220dd1bf9a0d9fe15e SHA-256: e72f98795e775fef268f95998375a64dfc319400a773a4f91e466b3ffb42036c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://synerhu.ru/uplcv?utm_term=sister+location+apk PDF link annotation
    • http://levotst.com/uploads/files/lulovorujiparorimamev.pdfIn PDF document text
    • http://tykhchem.com/upload/files/vezarazamuguposewozavim.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137771e900f9---8188271236.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/384469febab28e44e7ed7da64ef7894e/kufule.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/panub.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/gikovog.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/91843082533.pdfIn PDF document text
    • https://parfumzone.ro/files/file/mixatebara.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344fadac755---53311127506.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/padaxezivowiw.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7fbf16351dcc2feed83ca123d20e0581/zedinirozuwalonavovapaz.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/kitidinimekivozekad.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/fufigufoxajavagawo.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/76137042387.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/55172496543.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/99929055065.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/guguxubibetajut.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/mamutitonoxugimibej.pdfIn PDF document text
    • http://mestan.by/images/file/rireparulo.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/25357766775.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/50356660250.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/cd1358a7c2e451f55fdedb5e23546657/39369488649.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/13805311383.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/1936941297.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/32177134559.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/jawulurojoneses.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_off0000e18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18C 10532 bytes
SHA-256: b00d9cd1e2725531f9a123b5953888b685f19c2f03fea87ee9976069df2764fc
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 21956 bytes
SHA-256: dddc5d4f9330b50f7a0f2a092a06b10e30cf3055cc4d2722a353db6aa171ebe6
font_02_sfnt_off0001326b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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