Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d648dc297713b23…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 12:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4116801703f4a89677a509bc9233c7c1 SHA-1: 8fe5e8323944a738769294e0be2e374417ca21ce SHA-256: 1d648dc297713b23c82d7d2f488d133152463feb945262abc8f59f7889862c62
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS upload storage. These links likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/73f233182e39d0f0f83fd1b311dff002/mogikamule.pdf In PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/1f6839e4975cda5f89533e15c36af77e/95456599316.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/24761605029.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16129d03de725d---75312162491.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/2571ccbf12916d922d009c9b54f24464/kelurodagozajubepokepukas.pdfIn PDF document text
    • http://juentai.com/userfiles/files/41077383664.pdfIn PDF document text
    • https://hifi-markt.eu/kunden/kronhardt/ckfinder/userfiles/files/vibibepidafarapeges.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d90872010bc7405d35e2fe882e1961b8/3037183227.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/59995093936.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/lotegosi.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6b5f1828---22235609380.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/85803391883.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/6f8436f1ab1289fdd4b8cf37210b0f9f/44950380346.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c12f3e1dd---92842212897.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/793b543bc1944dfad61b77b9d808e80c/xafaxuresusugijos.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b639388bc9---patujulakozijub.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/45427888183.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/mibaranotidapixubo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/jobilitegodarinipopig.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/31987854612.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/b2059196408258d665531e07491d63a1/35017108285.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/7758646338e49218209e72f64211cd10/54218033893.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/88246f01984d19d7eafb70e506b23e40/diganiduw.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/lesurasukubalido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=materi+komunikasi+industri+pariwisata+pdfPDF 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_off0000e274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE274 10884 bytes
SHA-256: 55e9b8698f2b1bd199387cb206ffc30ad120a5d9372fbac5a781769cb9c8cdfe
font_01_sfnt_off0000fbaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAF 17256 bytes
SHA-256: 96eb45f4c5f5d18b23eaa37a389c08024cc476bfa3ea5ae6770aaf09c9fa7b4f
font_02_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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