Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd0aeb24067b7f0…

MALICIOUS

PDF

110.2 KB Created: 2021-06-29 17:10:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 66bfc9dbb24e9bb311763ca986402a9b SHA-1: 1b8010b09261e65a1ceb101f3e5ab8a76afac1c6 SHA-256: 5cd0aeb24067b7f0937ad68aa52f667efa2eef7960b158ac2976b064d3652698
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload locations and disposable hosting sites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baigiangtoanhoc.com/upload/files/fipigazefokox.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/c90fb743ea43342072d088ab974e4e10/giwotugifiwapus.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8dc7152c---zujokomezuvisomuvixeluw.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf680efd0---11009737168.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31feb2207f---36492379160.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/74885996524.pdfIn PDF document text
    • http://bscartridge.com/pic/guwigeret.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/25584968392.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1hhv4m3h6v2kna19kn475ocde0/10371077360.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/12he5qmgijcltvteq01inckj55/runap.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f51e86236---kewuritaxaxetolo.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/dilazidunuwanifog.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/sunazavinofu.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b85e8a9abb2---25541233832.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b46b63c7e19---devug.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be1ce828e9---29381382841.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wosenivadudotojamerokimu.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/vaxojumigasatudibewo.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/zawodibewelofatozelorit.pdfIn PDF document text
    • http://grabnerestriche.at/15391829068.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/cda57fc0c77595f9419a4df342f94c36/roxejiveralukewusowog.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31d9ab4130---zifer.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/sql2krbinqekrnvsnooj6op1s3/19651194382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=midtown+sushi+deliveryPDF 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_off00014c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C93 10540 bytes
SHA-256: 6345118aab2ba20b5155b8aa32bd776500cf8d823cbcff3915e60a73cb36253a
font_01_sfnt_off000164a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164A0 17544 bytes
SHA-256: 050433404a6e1b3a2d888805428639124e85532ae7b0bc81080207ecfcb6feab
font_02_sfnt_off00019231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19231 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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