Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9cc4f7b3381d60a…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 00:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 74836769c13761e53a011ed632d4dbbc SHA-1: f20ba9b2f376fbb7b9f4eb5c3aff086c807386e4 SHA-256: a9cc4f7b3381d60acfa1bfe78fd816a41b05b4eaae006f33602e13ca0230c2d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it may be used to host or redirect to malicious content, potentially leveraging embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.offshoreyachts.net/web_upload/editor/files/kexufiwujexidovozol.pdf In PDF document text
    • https://meganimal.pt/site/upload/file/93924731506.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/toluradum.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38440919796.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/rudijazexuluzoser.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/fujoteg.pdfIn PDF document text
    • http://4rrecycle.com/files/file/76835197631.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/79091832190.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/kerijeperipewoxuven.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d30e52569c---wavubij.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cdae6a0f8---kalan.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/rizasakap.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210902_520320FF0CFF26F4.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vosijunumisezadusosusi.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/18997052121.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/naxosebekonaruzenami.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/53030201923.pdfIn PDF document text
    • http://neowork-rh.com/userfiles/file/83979287136.pdfIn PDF document text
    • https://best-label.com/upload/files/ridatepivi.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/manoburotulovav.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210914014427.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/37113613894.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/sasudugususipesuzifajis.pdfIn PDF document text
    • http://www.moyekolodin.com/files/xosuzedepanifon.pdfIn PDF document text
    • http://eva.am/files/9ea9e229ad133cd7.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614dad2d3dfda---torovuruwefire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=the+forever+purge+putlockersPDF 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_off0000b0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AD 10620 bytes
SHA-256: a0ca58d1ccb83f37a643f58810e7a56b44eff7650e35e77e3658b55495c95d6a
font_01_sfnt_off0000c930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC930 14620 bytes
SHA-256: e8476b28078181dea76312974db244a4f31b7ab40260239e70a4adb8919a8da1
font_02_sfnt_off0000eda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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