Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a95b00d54b45784…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 14:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7bce466e7621a06c3d8ab1bb2c4dc031 SHA-1: d1f6395bebfb92b9aa7ffba5a983362ded5c03a6 SHA-256: 9a95b00d54b45784e1d04cdcc3f7e96cd12df961029ba86d82fb10afbfd0d1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613137e32a0c1---kuziw.pdf In PDF document text
    • http://thermcom.cz/userfiles/file/lupivilajanoxogutiwekew.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/pudumalazulufikone.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/zakogejedibolep.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/kunupoxewizonaka.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/8345108224.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/zunexuse.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/jaxujogoduje.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/96504409639.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16137c26b8542e---8378113212.pdfIn PDF document text
    • http://devison-matras.com/upload/file/25630931027.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210904_C5574B0842D510AA.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144274a408e6---21566073612.pdfIn PDF document text
    • http://melabo.com/upload/files/dejonafizomip.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/62643072677.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/wisikemufiporipuguwoki.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/pexurop.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/87685005276.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/xojotakalem.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/wijune.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/tibajiger.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=spoken+english+grammar+pdfPDF 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_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE003 17244 bytes
SHA-256: 2581e0cec04cd565a4ef8989989af992f927d23c3b67f2c07b2f1cbff1f24b03
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 11016 bytes
SHA-256: 66775666515f61dbf1bc54ad611516f5ed9246c28b035472fa2f664d3ce72f65