Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86a1f856059d592…

MALICIOUS

PDF

75.4 KB Created: 2021-09-03 22:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 696eb15253f5fe3e7ab479453b9f35a1 SHA-1: 1d4b9ae4c91feb0398bb1fb74b167f26ddd4dfd9 SHA-256: d86a1f856059d592ef64534c42cf8f248a4d93d9bf93b2c0675fe912550430b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alate.org/admin/fckeditor/editorfile/gavaz.pdf In PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/0f086f5b4541ddf88feb2de4dd2732b8/laluwitazawipofifadudiguw.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c6d0b26b228a64a391247463afc9a230/zoneremefabavufuzepunofu.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/funomujupepibukovoso.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/20619252208.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/87864564198.pdfIn PDF document text
    • http://eastbrunswickliving.com/clients/77672/File/37296708476.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/98251326524.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/10027579871.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17096487350.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075dd9e4c013---gigivobifatonazawume.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/47734974534.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/telitisuzinowivaviwunirej.pdfIn PDF document text
    • http://chinahongji.com/d/files/56536322377.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/podisix.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/77410222651.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/28da6106fb899acc6c492fef9e2dfd80/miraxutodapu.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16091b9743c4fa---gatozewu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084faab9353e---wuxikijo.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/88ue22hnbmitq8anrgrbsphegq/81224378794.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdb5b0b675---zinutefofogaxo.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/dilajemobigem.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/lafisasamavinejowari.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609472cc7419d---nitakomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=class+10th+ncert+book+pdf+downloadPDF 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_off0000c0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F6 17644 bytes
SHA-256: 3c21ae1d3a1113c1504b0f9bbc47efa526e3348a6bdca00822ec1b8a11018e9d
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 11148 bytes
SHA-256: 7d7528ad7324289b1eb4fb79327ff8269c78c0c11a5c45d45db93391601f3d22
font_02_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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