Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3eddb957f66557…

MALICIOUS

PDF

80.6 KB Created: 2021-09-01 17:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e1305bdf8978b2bb424e415891f01ab SHA-1: f594e30b8749d1b2a7658451640348e3a2cdfe58 SHA-256: 8a3eddb957f66557cf5c2096c61b06206461598415c3c5c6ba1d046a4dd3f41d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to redirect users. The presence of these links suggests an attempt to lure users to malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/08c6749d41c89374cb9b37f86f70f2cf/36442455608.pdf In PDF document text
    • https://lecourbe.dk/userfiles/file/14054111806.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210814_152851.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb64fc8b59---31932519342.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdbd28b10a---rakoviku.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/nonenipenakebebazupilil.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/49326155760.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a7781bbf5---32578504812.pdfIn PDF document text
    • http://clinicaveterinariagoitese.it/userfiles/files/tetobiditozotuvasibuni.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/tgbuio6vpc2j7fvlp21u72i34p/zubutewivuvifokatabazirux.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610769ca1c6ff---jilepenesotorigujekofan.pdfIn PDF document text
    • http://bahsclassof1965.com/clients/1/1d/1db829f64c2e26d3b32b12ccabba4d7c/File/bebusimumetolerufi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16083fdff6350c---47346163262.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/q7sf7vok0b7uinpb73h0i3bi92/71007884027.pdfIn PDF document text
    • https://bnovum.hu/downloads/zitolobugofuxinug.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/soduzifof.pdfIn PDF document text
    • http://sibmetiz.ru/upload_picture/93763538891.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610dbb4403a83---95750115962.pdfIn PDF document text
    • http://rainbowcaterers.in/userfiles/file/64322084735.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160911c5f95283---mexomexube.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/zuwavosaz.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/0svt16do8e208d3j3bir0j16gl/vofulifebuvoredovapaf.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/gesawararoz.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbd28ecfb---garafago.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/zanimegisilif.pdfIn PDF document text
    • http://gfb.it/upload/fck/file/17266609981.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=stay+at+home+order+todayPDF 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_off0000d964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD964 10292 bytes
SHA-256: f2aa53fe9e93d606bbe379bd84d2de9e1c539a12012bf953a3a4f53d74606419
font_01_sfnt_off0000f0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 16848 bytes
SHA-256: a9d6d9eb233996d124b8ba39a439606b42c52259332e12006aecbb0658a44868