Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f018c8e5284c9a0…

MALICIOUS

PDF

89.6 KB Created: 2021-08-09 09:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42c05614677b823fea59a4c1559f4d79 SHA-1: a6162e5f57bb027b732770e87246b773c40720a3 SHA-256: 3f018c8e5284c9a0aa9b64058c19b180511af7bb1fa23a6caa59dd99d1793fec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS uploads. This pattern is commonly used for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=fcpx+intro+templates+free PDF link annotation
    • https://wildarium.com/ckfinder/userfiles/files/57802341746.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad8e40111---pulaj.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac11fb4015---sufenuxulud.pdfIn PDF document text
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/30698342349.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/kozat.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e72f72973---44958735496.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/puwarezimubipe.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/zefupudasizolifud.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/tesulenire.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/bubibefokokof.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/737160078146aca15d4cd16aed1f5a27/89494092069.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350002dfe3---fazukebow.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/xelibatufidalaloleleg.pdfIn PDF document text
    • https://eetravel.net/file/34965476633.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/034efdd075487a6f9e3648be1d039693/pigulepowasavumam.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/dumonoxebawedop.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/77548992347.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/54970406552.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/2484526524.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/54859709777.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be11206db---xisek.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/tikegaru.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/9dbb25d5928a023d398dacc139269c21/zilukizewabe.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949b7e9267c---duxesadisanilub.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_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11207 17388 bytes
SHA-256: 1c9c36c73f840995328fbe771aebb1e182507701035afcb83b30588d22293536
font_02_sfnt_off00013f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5F 10720 bytes
SHA-256: 732fe0ad046048124a67a2af099692a7932292ee26af6ec095b8562853fbdef8

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