Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d91a7b0b95d8a83…

MALICIOUS

PDF

93.2 KB Created: 2021-07-03 17:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ecce2919ede2333ea6991332a42192b SHA-1: d2678528a854ea71d4463d2cf0988062f5f1a42c SHA-256: 3d91a7b0b95d8a83a3c4f38dbb08f1de0f726dd6086a5c84271de80aabc6eb91
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 compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/d80mhijo8tj45qup15vrj5h9l0/51524955711.pdf In PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/81708228783.pdfIn PDF document text
    • http://freeski.hu/freeski/file/63045057394.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/c1d440c09a37b3e05dcb359c7aaef32a/numojutubijinokek.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/36570888080.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/45djsnkmnl6meldptjalc1m9h1/gexon.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094daad9813f---fogimata.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/goseledekisela.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/6056be546bb9593ca265ee50bb480ee0/vijuverav.pdfIn PDF document text
    • https://sbufficio.it/file/2334664099.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c028ed80d---8317754366.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/47256162642.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/26040493012.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051517153956.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55b11c0aeb---dikosatugizozegumajedil.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/616f4fc54edaf6c2d0cf2dc2a782a6ec/fovepisaserusigav.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/dfd3dee7d0c425911c5fe200a6f6fb0f/13381418591.pdfIn PDF document text
    • https://saam.vn/images/content/file/25968190788.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/88097191836.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8775d12cb11c07fa3d44e93b4e9721c2/93474348266.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/81026506254.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/a81a60928f45b7714856582c66940450/40119451264.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700850c879c---wepesiloxabekadalureje.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/xediwiwudapubakijuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=sales+administrator+interview+questions+and+answersPDF 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_off00010787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10787 17636 bytes
SHA-256: aa821a3da4a716954fca90f4dcc473d1404a030ac9ab9a5c2a2e3943b4418e6e
font_01_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E13 10884 bytes
SHA-256: 824b6a2b08e2967603b53c75c483e1cc55d3037223a58f319278ff29fb7c379f