Malicious PDF — malware analysis report

Static analysis result for SHA-256 91ba3afec641affd…

MALICIOUS

PDF

75.5 KB Created: 2021-09-11 23:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec21ac11cc096051063799e4e49e343c SHA-1: d3bc053c7ed74f445a40ae0bcd1fbf07af5f18c2 SHA-256: 91ba3afec641affd058b9f394082925f00f00d026c614943beafd9153c7cb203
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's designed to redirect users to malicious content or phishing pages. The presence of embedded JavaScript (T1059.007) indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=ghost+phone+pro+apk PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613877c60a2d4---55299080372.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/xagudiz.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/kudekatoxujateb.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/vpb94qk84jujnljnls2ce13pf9/nofidogozemidaditugodobe.pdfIn PDF document text
    • http://bakoca.hu/files/file/pokofaze.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zixizidalesumesepoduguj.pdfIn PDF document text
    • http://amandamaitland.com/images/file/40580338058.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131cf68362ed---bapijapuk.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210902_391FA508D060BBBE.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/38125048153.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/57925991882.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/11561603978.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/42887062669.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210902054603.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/totazigafaxuzidet.pdfIn PDF document text
    • http://atputasbazes.lv/images/userfiles/files/81350148763.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11430861122.pdfIn PDF document text
    • https://fratellifurloni.it/file/36509537575.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/dne6m9pivn4gb41v14ce59n6qt/53067732470.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861a9a123a---26433715465.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/40836763918.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130afceb1190---venuzowir.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_off0000c12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC12D 18720 bytes
SHA-256: 2ddc26c5892ab803e7452b76e7fa7e13c7c380c5c1271665e36ed82d4cedcfc0
font_01_sfnt_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 10340 bytes
SHA-256: 4d5a0aff3508eddfd23e6bba4bfadf5ec4e8ee385e89e4e5d02574d01141d226
font_02_sfnt_off00010868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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