Malicious PDF — malware analysis report

Static analysis result for SHA-256 e045b4e6c32edfee…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 12:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fed65708847f24fc096323fccd73559b SHA-1: c55578d50cc10b0b5153b4bbaa24e2540c7a90c4 SHA-256: e045b4e6c32edfee730e3812bdb8110ba4560092990a925f7239eaf50377f310
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://nomylo.ru/uplcv?utm_term=bolt+nut+washer+catalogue+pdf PDF link annotation
    • http://www.jobsincrete.gr/images/_user_na/file/69628466608.pdfIn PDF document text
    • http://tomnhenryanderson.com/clients/8/8a/8a1068334c160bb49438aafe8043afff/File/18005275422.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/peperom.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/bolufiditarivametin.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210821073616.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/fetuxoda.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/cb4efb989003641a2b0bce1b890f9f53/kexavijebe.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd024cb444---46507374353.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/47538020115.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/tosizadogejirer.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/tanifow.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd647eb4e1c---jopagovew.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/78352233167.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/58579744068.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4ej98rq2mal9tuk4v46ofqn7em/36548837720.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/figinugozijitegis.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/jupomirizufelagisaxafix.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b9574e0a2---nizovuxilej.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mf92kr4352ueb5us5qibaljot2/davofefegakoxikibegavuwa.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/gataxifubadobetetakavovaz.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/242b675a9ca340ca09418694f29ee1e9/posezatolojunivi.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/95703224508.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160e9556391906---sugorepisamoseweva.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/918d3266ac22de8d2e188411e3b0cbc0/bodadolo.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747d60d3940---tufarag.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b37557d0e15---vibuzuvomitozan.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_off0000c9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C0 11044 bytes
SHA-256: f433a0bab7e157ab98734d3dd7d384523ed7abeba4d165bbb5bd671f416e0c95
font_01_sfnt_off0000e35c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 17340 bytes
SHA-256: 02575dad2d2198f59293d03192336e7425f7db0dc1fffecbf1e41eb757086958

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