Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8e92748417db79…

MALICIOUS

PDF

90.6 KB Created: 2021-06-30 03:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7c75032d6c549d6916e6db5036df235a SHA-1: 002c64abcd6da14f155f8959ad352f076bff64ab SHA-256: 9b8e92748417db79dd67e221c51e751772f0791867029dcbb8b16a333e9e1697
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis point to a multi-stage attack where the PDF serves as an initial lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=create+your+own+comic+strips+citing+the+scientists PDF link annotation
    • https://akvaguru.hu/user/file/44099770046.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/42411148003.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a639551c9---41538997676.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/nirifuzabazisawuxevikir.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/botamazepexuf.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cc7a106de---62213894335.pdfIn PDF document text
    • http://berrybucs1973.com/clients/3/3a/3a2d6910be1067feaf6dc79f90d505e0/File/39898336697.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d9bc3ec81---49896858054.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/2a0d8b3a482852f520ebeb08ee333441/dezimupumodufabura.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f452d691e7---48162239483.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/de391359f76f7dc0006a11ee60bff4ef/relakaniver.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5rp2giccqntrfmmp8ae33qrgt0/zamunifumufapowimedin.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/22796765991.pdfIn PDF document text
    • http://change-sexy.com/files/files/jasafexoru.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160870e8f13324---48691231315.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/74241786022.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/sefoputatagebe.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/kubexikofizunolaw.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/762cfbf2d2f84471dbb34f00d9d1cd80/55636751255.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78ea508bfa---39488196321.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/xujefimenixegelid.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a85eebf04---171476995.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd04864fa3---20601919634.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/nenikijolata.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/94940517274.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c069705a5---93277389162.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_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 17688 bytes
SHA-256: a20054a625efb3c4875422c4975695eeaea9e15fbfced3c72948dc69209d2526
font_01_sfnt_off00012ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E0 11104 bytes
SHA-256: 45b6e7745bdc4901e88d2b539025d20fbf2a2a0a00a634fbd9a6ef565641b487

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