Malicious PDF — malware analysis report

Static analysis result for SHA-256 913066697c8714b8…

MALICIOUS

PDF

118.3 KB Created: 2021-08-28 11:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c34a254acb60a301bad02775616f3f8e SHA-1: 5d61f56e02604bd8ee2ed1ebb5c107ac3a373b9a SHA-256: 913066697c8714b808a9ed9dbc07f3f67f6209465fe0bf6916e3f9a66ed1983d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, disguised as a search result for a book. This pattern is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload.

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://philabc.ru/uplcv?utm_term=21+lessons+for+the+21st+century+full+pdf+free+download PDF link annotation
    • https://mimpisiluman.com/contents//files/potusutolisog.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/73934047660a0b2b64ec4a.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087fea4b45b8---pufuvukidobovaponiwaj.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/rorikajodibasizebebegu.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ir3u3fs571723p1pss1mpkauu3/sotudasozo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/wobopatinugawolo.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/60947721197.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/10280446719.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fgels8qfd20c9ndsd7hfg2abtq/nusanepapixizetedezogogar.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/52771940563.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/totidakarimiraf.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7041221d56626c7d13298934ba4528b8/76810569154.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b134c274e3c---lijidukuviva.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8a7d56230351b65443cab87336a38e7c/zojigulerapalu.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bf3936bbbd71c807fd677134b43f8a60/48182854837.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/tunamulamunudopuvovile.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290e51e856---migefigegurulowif.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/xewogofifiporom.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/tf4t2hqm1vcl8ou0pq3i5e5ved/jolegigezugun.pdfIn PDF document text
    • https://cooperspick.com/files/948246330.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kumamorobonelo.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_off0001653f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1653F 11000 bytes
SHA-256: 8d6e50017d8a3d6d36d46e89d9bd9f1c4480fb3ff22d17b5faeb4c1919d56f2a
font_01_sfnt_off00017ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EF8 19568 bytes
SHA-256: 38377088c3fd199065bbac3f4d9398aeac95cf11b115c43069ae2431ce606891
font_02_sfnt_off0001b299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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