Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c445b05d74148f…

MALICIOUS

PDF

86.8 KB Created: 2021-08-14 10:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5b7869c49694bfbaa105766aca92713 SHA-1: cf535d5b91f3dbf95620ced86b8dd2f3e153c1bb SHA-256: 04c445b05d74148f92db564995c63bfa4d88a84f77b5402b4023405113b68146
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs and link farm structure are indicative of an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://synerhu.ru/uplcv?utm_term=electron+configuration+chart+for+all+elements+in+the+periodic+table PDF link annotation
    • http://hoadondientu-ptp.vn/images/ckeditor/files/nuzume.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/a9c88da977ff87946a7e82fae0628759/bitixekakolovijapezuzo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/0d13615bb735b2f03bdd5a778b0bf0b2/lumubelagarorif.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/71797921357.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/94432428785.pdfIn PDF document text
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/82207141767.pdfIn PDF document text
    • http://edelstar-mos.ru/files/rapetimonenemo.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16071f7500b100---gogene.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/0f894c0b99526dc5376614e66e155dfd/dunul.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/wixepanalojukedix.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/10292388279.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b888377a8de---ninevuvup.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/79edef32b326ef0b840ace9abd231152/zijujofexakesoromudulum.pdfIn PDF document text
    • https://armandofalconi.net/userfiles/file/50668206308.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/25950990135.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a309a4c915b---31527579929.pdfIn PDF document text
    • http://ledson.ru/upload_picture/gavireruvevawuwefomawiro.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/98730858670.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf48c4c5ad---maruwaro.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/951109987.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/77986582215.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_off0000eb98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AA 17152 bytes
SHA-256: 80a235fd194e7cf1628b75d53cfa67c1fa27f25435714a65b96a3d0a7ea84fe6
font_02_sfnt_off0001305f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 11288 bytes
SHA-256: f5d36f6cb5e462bb6a0259cb2bbc5facc0c8fbf40eb1ddce52198c5a3e58cc5f

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