Malicious PDF — malware analysis report

Static analysis result for SHA-256 683e1923793fcd9c…

MALICIOUS

PDF

85.0 KB Created: 2021-07-19 18:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b231fd4e6b4deafa6f5e601832d9c08b SHA-1: c37e4229c89f8d93e9bff4c6adaa4810d1a4ee97 SHA-256: 683e1923793fcd9c9607a052eaa43edc36d1451cc466c1c788c10c1ead037243
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The presence of a link farm suggests an attempt to distribute malicious content or traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://coopmong.com/ckupload/files/81646726264.pdf In PDF document text
    • http://mt-filtration.com/uploaded/file/145007952460c44cd530e32.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/80235279303.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/abb9600085d234b9c5c60a4728e42bcd/sojopasaki.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9a636528ac8358db4c2a69c7a67e6cad/xerinuzegazerowi.pdfIn PDF document text
    • https://lordoptika.hu/files/files/pokurabiwalo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/kaxurebezajavopegadimer.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/fuxavawetuku.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/60673368441f0519e1f6d5e5af701398/sefojabutovabirixarere.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40221778580.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/4cbffeec6162040265263d2c7b65a7ab/lalesekemotoxum.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/suvadoz.pdfIn PDF document text
    • https://agatanorek.com/files/file/55899221333.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60fd1cd23d---97715363755.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/58351023724.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/memodiburaxejeviduwikikip.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/6177585713.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/npgrfoanl62l25j288gn7d38kl/linijezoxesoxijiv.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160db4e9416b93---gumuluberinadixuz.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2689518475.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6glnme4o6r8mq2v2v2q5fm2587/xupiguzunadijow.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/o12hr2hl6dcj6ilem9kc652bj1/ninajiladirivaparofuf.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210719_A8B1A9AE959B2C5D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fill+out+dnd+character+sheet+onlinePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 17272 bytes
SHA-256: b1d61f23fdbe8c8bccd3d302157df5330e6d9bbd86e2cae503856d92d8491013
font_01_sfnt_off000116c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C7 10544 bytes
SHA-256: 3a2881fac3d39e8348e430fa8d0f7aa1df6b160aaca3aaf0f171af7e482c117c
font_02_sfnt_off00012eb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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