Malicious PDF — malware analysis report

Static analysis result for SHA-256 f611064d91c846cd…

MALICIOUS

PDF

87.3 KB Created: 2021-07-07 19:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76f7772810d4f6caa29f1b735a27a790 SHA-1: 2ec50aedda751244b13af70e25cd357b25ff32a9 SHA-256: f611064d91c846cd4575990630714b7b74af6da0684d9c220ff53c01bb995c8d
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised CMS upload locations, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external links, many hosted on compromised WordPress sites, points towards an effort to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867c22840f2---74551770344.pdf In PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd622ef42---tigimowolono.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/88aebb24dae34fdb5dfe55300de2c88f/32171055647.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/84231624938.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/94161008448.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c0f329adb---14827990666.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/19501913334.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b942a037---suxofapododopetibes.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f7a48a4ogth53h8j75a22ss4t/4876010325.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/xuxexutorokefaji.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/572ac7ad07e7c93dcf0d0cfa44cc4306/gogapowasakovun.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/2683f6799f73ffb30159b2c3df02ee2b/59667488888.pdfIn PDF document text
    • https://iwistw.com/upload/files/malagilapopoziwepexid.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/savax.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/lojizefirexulupif.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37a4487f---96805515717.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/solifomin.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ced0be3887---vamenurufewenivexa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fb77022d---18010381511.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/77955791701.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d116d1b904---26773754883.pdfIn PDF document text
    • http://ipsgroupjjn.org/userfiles/file/vikebaporiwutapunulin.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/2889588787.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2oph7d9it66v3qkq70l8befp4d/59055699094.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/luwawagomovaxivisidoberoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=simmons+sd5x+manualPDF link annotation
    • 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_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 10492 bytes
SHA-256: 402e21607781edb64bf3940723a90bbc1267ed1fee6c75e78bfb2ec88f2529aa
font_01_sfnt_off00010830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10830 18092 bytes
SHA-256: fc23de5e82423424e2d27f38e52e2c253cfcc71a1d3f90c3a4bb4b5ea1174875
font_02_sfnt_off000137fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1