Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ac482880fc49e2…

MALICIOUS

PDF

95.2 KB Created: 2021-07-25 18:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 70b08db61593fb0ee5db208772fffb23 SHA-1: 156983f2c3b124bdbb3a51b8a402e47f1e403701 SHA-256: 83ac482880fc49e248a1d2bba430bdf61b54c85c208f0c52bb86e9c3c7fe73c9
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and disposable hosting, likely serving as a lure for phishing or to distribute further malware. The presence of embedded JavaScript, though not fully analyzed, further supports the potential for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vj03cleemav52clnkhvhjkka56/37662457055.pdf In PDF document text
    • http://schokoladenfontaene.de/idata/25524015295.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/50662733273.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdd0479885---57682369958.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210515035954113.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/aae4ba870fd0ee9e5d15b1eca42c8853/16821772566.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/43975716867.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083283aefab5---zodixuvisosefotosox.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/ca585c1dddaa463cfc125082fbdf2435/5153263029.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1pbaqfkvaiulk2v2h2vfrma0aj/zibiledenozof.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/519d5d46621d0436aff4f66d050f235b/weboraxozarudimixelo.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/wenesoz.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/2d0aea1244537e100f132064875cabf2/58717920885.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/vudawinuxino.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8ac57d6dd6d74ba87b4edd8c26ada137/vinet.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e4ce948bb4c1edbe887c0b302134becf/94773146067.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d8e1c1d4---54839794099.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/49252822765.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/naxipufududulowuno.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/58456368557.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/gilegoratagak.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/38946625035.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+learn+dental+anatomyPDF 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_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 10340 bytes
SHA-256: f35ad67d81884c2f9a359e5e5fe44b2362fdb385e4cde68e60e6411d3ea2e8a3
font_01_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 17336 bytes
SHA-256: ac3e17d908aae499fe475ea9ee8e20f0d011ffec265871826ea8511d6c8ff6a7
font_02_sfnt_off00015748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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