Malicious PDF — malware analysis report

Static analysis result for SHA-256 88de7d5e3bd72235…

MALICIOUS

PDF

87.6 KB Created: 2021-09-13 22:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1a9ada256ebebcc1771d9b7cc3be0d4b SHA-1: 32c7d607d4abf78e1c35239e0b708fb69564e22f SHA-256: 88de7d5e3bd7223557cb49848cfd8b687c168fd6f39b9838d65334b41a34036a
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document employs a social-engineering lure, instructing the user to install a browser extension or update to view content, which is a common method for credential theft or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it may leverage JavaScript for malicious actions, potentially leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://abaj.cz/UserFiles/File/pepamalinamol.pdf In PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab50f42b8f18eda3b415cb33dec68044/solerowafigozanemipotope.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/84031191778.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/wopexegevubexusi.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/77758301303.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/975886419.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/74320798604.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/28616669303.pdfIn PDF document text
    • http://billsky.ee/files/file/1506463188.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/pojev.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/90324044926.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/jerawodawujuxidefuj.pdfIn PDF document text
    • http://tns-china.cn/editor_upload_image/file/relunobifog.pdfIn PDF document text
    • https://kildevangen.dk/files/wezadevoxabetibonodut.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f59b263b53---6408873793.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/60132579609.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed729bc4e---jumakarep.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64ae741a9---19218877008.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/7ea038578537839a15481781ac2c307c/koxabadozima.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/zesidawifetipuxamibivu.pdfIn PDF document text
    • https://salwangurugram.com/files/11748133832.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/wamozawarewogobapofobil.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/tepixudelexisavinazew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=formal+email+for+sending+cv+samplePDF 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_off0000ece4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE4 10908 bytes
SHA-256: fdb9eb1117cd179d1e94abbd1d70042c839ec15a848c3da32f5f975edee6af82
font_01_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 19712 bytes
SHA-256: 0666c7c63bb8f43794c1a7715ad26bc41278559fc1549162ac7efaae4b5be37b
font_02_sfnt_off000138c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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