Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7905bf6fdbd447…

MALICIOUS

PDF

80.6 KB Created: 2021-09-06 08:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c40ef17dbca1097a61c709f55f49c162 SHA-1: c18ed59e1524f7ac5aa786be147fe5fa475e9c5d SHA-256: 7c7905bf6fdbd447f8ba18b8a024aa3bf75d018f068d68c08245da58d0614590
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS uploads, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://queure.ru/uplcv?utm_term=english+grammar+book+in+gujarati+pdf+download PDF link annotation
    • http://buyyoutubesubscribers.com/ci/userfiles/files/wamikanekokijadoruxuku.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/80777077176.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/92979092621.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/povazemafasinupalug.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/sepibowojefa.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/47474471780.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/81583689280.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/cvl4p4ahof7vr9oimpug58e0t0/tataki.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/22606197551.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/0898c2e056eeb814b25f23d190e87a0f/terele.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/86581849129.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/gilarapuzexadegamoximire.pdfIn PDF document text
    • https://chptravel.ir/data/file/tejikexozafanomige.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/5202e75c7f770b5f2ad6f09db8d4e49a/85528382333.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/36860661316.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/32797586233.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/piwederafujipabisejina.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a622fa78f2a---nesodazeva.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/makivirowisixesifagixefot.pdfIn PDF document text
    • https://papiratisk.cz/soubory/13240027035.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/1cba7c4a233635fda64520f7de7bcbd0/biloziwali.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16083ceffbe79f---83337009357.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/xepiduseriremiz.pdfIn PDF document text
    • http://haverfordhigh77.com/clients/e/e7/e7c5a96ea35a64a1345a575153f12e7e/File/kexuwanamikodizamaxoro.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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBB 11344 bytes
SHA-256: 84baf41f2a5115c13cf55b7bfcbf8ef41a61539a0f5cd0a518d2b31423c5fa46
font_02_sfnt_off000107c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C6 17688 bytes
SHA-256: c770f7e693cc7a98b44b909f78f9a203027aaeac0bcddf919457a3ad2694cf30

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