Malicious PDF — malware analysis report

Static analysis result for SHA-256 2625d7029fcc24d0…

MALICIOUS

PDF

88.3 KB Created: 2021-09-18 21:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 202654209fad4a1785d7ee95808ac751 SHA-1: 5ad54afd2bf1561e492656e6180cfbb2bb0ee23c SHA-256: 2625d7029fcc24d016ed1809d0315e1b1e3f3645244de6accacd5458de7ee69b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristics indicate it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains, with one URL specifically mentioning 'chrome 88 apk download'. The 'Browser extension / update installation lure' heuristic strongly suggests the document's intent is to trick users into installing malicious software disguised as a necessary update or plugin. No scripts were extracted from this sample, but the overall structure and heuristics point to a social engineering attack designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://garglob.ru/uplcv?utm_term=chrome+88+apk+download PDF link annotation
    • http://paroissedementon.fr/upload/files/827499623.pdfIn PDF document text
    • http://e-sheremet.com/img/sepoxuxotibi.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/viwidukedelarisub.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/xotuvunetakudibopa.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/tafobotumeveku.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/62323527574.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/fodupafedabokiwe.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/94196268015.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/29605951337.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/xopawejo.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/lapexon.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2229638d5---16186682833.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/84053354646.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/82886409577.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/62658788571.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/xigetasesutiguvuwile.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/11354489558.pdfIn PDF document text
    • http://vit-physio.de/file/busovuvevavij.pdfIn PDF document text
    • http://polishedskincare.com/minaret/uploads/file/sokabozozijuburegikut.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16137a7da7289f---mipemuzona.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/54282803103.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/bunewabitelom.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16140f306ee613---63104470952.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/dokirevibune.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/22897935490.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/29249954451.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_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 18604 bytes
SHA-256: c7fcde6b753e229d4e0f82e55d2de1ea888b3b4551c385d65e5763f08a2a08be
font_01_sfnt_off000122d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AED 10716 bytes
SHA-256: 6d5b107ff3bfebafab656dd763aed4ce6ae7cf896281b814511632aad42a2ef7

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