Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2ff06a84a05848…

MALICIOUS

PDF

106.3 KB Created: 2021-09-07 03:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 410b3d97d4c6ae8ba1a5a05765cb6d0d SHA-1: 458235cdc6ed84fff7559de42dea788727679d3f SHA-256: af2ff06a84a05848e0e353bfdde04a0f7f778e12427d16f5f2eae10eeeddfbb8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains a link farm pointing to various compromised websites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://cructi.ru/uplcv?utm_term=imitating+christ+pdf PDF link annotation
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/tifuzemab.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160728a896a8e9---tijaxovito.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9e41889bf17d94874cffc794ae6236e8/xejikafavitalevafax.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/xitezekogapununevurax.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbd35dd477e---36275313919.pdfIn PDF document text
    • https://masukpt2.com/contents/files/javiziz.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/bosujagodaluwog.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/xogipodafiwavinavunuk.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/42236906146.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/76053700573.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d00b9a09492---45222549215.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/tumif.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/pusagorasebawezeboz.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/59549902594.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/99030612486.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/78143179714.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/emn56hs7guaoh3ngc5b6i8e2b1/69879910534.pdfIn PDF document text
    • https://unosms.us/userfiles/file/41500639439.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/vixoguwolawikagajik.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16070df4b1cb4b---51529806370.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdv1ua3vfhnhbk0eos8389j68e/28503472399.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/reperoruxox.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/44527358182.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfdf7abce3---92536007446.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/seruwujudiginavulikego.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/9c4daf6cdbe74bc868cfdb509073e4e0/laxidogeguv.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/vegofufivu.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_off00013740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13740 10720 bytes
SHA-256: 93d8ddd01030aed97dae430113c55c385c450293a04b39e7a4e62ad5661d2ad0
font_01_sfnt_off00014f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16778 20164 bytes
SHA-256: 756a09efde380b22990ef92d92b913ed2040a0f246409f411a8e023eed455e10

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