Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b7c90dc1147c26…

MALICIOUS

PDF

92.3 KB Created: 2021-08-04 03:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 78dc2f5c0d067ae295e34738994104ea SHA-1: b07f78d5a176cd87c3949c34b32864589a675970 SHA-256: d5b7c90dc1147c2648fd78591ed63cbacced9393055e3c7c2e7fad8296a9628a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF contains a link farm hosted on compromised WordPress sites, with URLs like http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0937f80470---51730181335.pdf. The presence of these links suggests an attempt to direct users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/94kepk8qhdppjtse6t6f79dgl1/96796343462.pdf In PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b07e88757a3---xolaxadatokeregigovemuj.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/40028106361.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/01e7f1e4e21fb331ec01741179ad7516/55680040752.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/8755775403.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b0937f80470---51730181335.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/96512188608.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/45bsip4thoh00k2qkongl85qf4/48091780101.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723e4d9032c---ganazomepaxudunelinuziz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c9aa471f---fivekefi.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3613c1a85---37031520100.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/rodogifeba.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/bitopiza.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/6f6b9fbd1652160dc63f4553f34517ee/zabat.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/c7b9edb4105824eebbc55a4c46ccc3a4/pugusuzabese.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hp0nbj90ojtprbno5p13a5k3m0/94871895810.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/monomejalezomix.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8e5c4ca9423c3cd1449a11367eafd3ae/94541642801.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/24348951183.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/06f05a8a42a3de8ab353e21e18931093/55909853444.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/21503112165.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/zajenuvexala.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/39n45376s2opme8jcnu282d4r4/kelefumigutebenodabudix.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5044552a8f5ea540fa2962ac7c8cf924/fokuguxilazakar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+i+get+groupme+on+my+macPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF44 17292 bytes
SHA-256: da31d6f95ad2486595e7f342b4108abe9306aad0536a2c7cc91936a3f705e249
font_01_sfnt_off00011c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C92 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00013211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13211 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A28 10748 bytes
SHA-256: 7a4dc85e1afd28ccb09ee75f73e9d28947f07edfc28934e65d258cf0f48e9f30

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