Malicious PDF — malware analysis report

Static analysis result for SHA-256 a095e79edd7faa8f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-16 11:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 70559649bfa3f77673b40f6186122858 SHA-1: 71cc1be9d884a7603a00c6896140951b7ae11a95 SHA-256: a095e79edd7faa8fe835769bb7fdfa2b16dbfd8d25a2048814e207c26e3b891a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=open+world+offline+android+games PDF link annotation
    • http://timocomputer.cz/files/file/72917301175.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/30113850677.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/lezosuwulixurunuzil.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4b3418fa0---34245367064.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/valojodizanoxuwejit.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/70875290697.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/puzusaxememediki.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/22822035105.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/munijamorufelo.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/lujapovufino.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/9334331008.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630951243.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/4032965952.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161390d813b183---gufaz.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/sisedujerogenenawawa.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/66653984790.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/lenimugaxepug.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/09941fe93c0f0b10b20c3581b1898329/167459460.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/puvilejuwuvazavazomarev.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109041356124870.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/diganatipuxalo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/25072746529.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/38546540833.pdfIn PDF document text
    • https://madhubanindiancuisine.com/nbloom/fckuploads/file/baguzevuri.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613321f159dfd---38392000570.pdfIn PDF document text
    • http://vhshf.de/File/logigimelepevawug.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_off0000d90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90D 10852 bytes
SHA-256: fee35de421157fcad9f5000a8664f948e3a0182853d58cf1664146ef5f02b9da
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 17356 bytes
SHA-256: e16ef0481ecc5b71dcf9e992c3c849242b2e02acf245aedb12f4734169a56514
font_02_sfnt_off00011e58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1