Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f2a273befa2f0d…

MALICIOUS

PDF

86.8 KB Created: 2021-09-01 14:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a98eca60c45fe3467aea44f123fff806 SHA-1: 52766836debc85f6672b639214a139565379240a SHA-256: 88f2a273befa2f0d507805cf69293e3c9b4a2edf86b90c75b4868ab45963a9d1
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. These URLs are likely used to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=manual+fuel+injection+system PDF link annotation
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4d3bcf6cae3c4ea52b7a47d7c3cfcb42/55363393290.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/96101921764.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/59373625378.pdfIn PDF document text
    • https://slide-bearing.com/d/files/60108517040.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/23531114790.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/9614526052.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/tisev.pdfIn PDF document text
    • https://ivanamihic.com//files/16361794443.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/eq4loqk00rtj4pi7creker7epu/28752664689.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fd22f39d---tixojilewubimivozarut.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/kawonunaguwevokabu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/21uuivscvtc81plnrtvo56s9v6/pepozedamivefa.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ahhnabe3rdc9ko7t911o52qvmc/92034423019.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/43961464122.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9481b9421---97648974556.pdfIn PDF document text
    • http://fkhd.cz/data/img/19783794831.pdfIn PDF document text
    • http://mousike.it/img_ins/files/29490100091.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/forekapatakobelum.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/50680528344.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/mabisaravegesani.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/fumozobifinoxidibutag.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/fa0b73bd35eec2f13824b53df9fe5d08/44493215288.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4f11782c---fofofetital.pdfIn PDF document text
    • https://drrajanmahtani.com/userfiles/files/22683563492.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_off0000ed9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 18396 bytes
SHA-256: 2365560fd7ea14d4e462431d17f8d78c47f4e11091c00722049d5e7b49d6fd4d
font_02_sfnt_off000134aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AA 10732 bytes
SHA-256: 21c1699740ea45419a96899bd4a568127d83e72c7a835aaf80ca6a9e40dadbf1

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