Malicious PDF — malware analysis report

Static analysis result for SHA-256 716364612751a6be…

MALICIOUS

PDF

87.3 KB Created: 2021-10-05 22:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c8374ff956e8a5fc12b5c9244d4413f SHA-1: 25fa7bf174134ee7cd937ff5949584ad88fa4ab0 SHA-256: 716364612751a6be6d48dacf5bd422e463e92ed8a1c279dd645516a807d85dc6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially compromised content management systems. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of multiple external URIs and link farm heuristics supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=the+walking+zombie+2+pc PDF link annotation
    • http://hueide.com/upload/files/15754057038.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210930161953.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/47856845827.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152e9467772d---lugujedasoborapawi.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/62932973385.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/c001ce7217f72bca191ee32797790500/zefuzuva.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/vokereruw.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/nulabur.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/legomujirinuno.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/54777009068.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/74470929017.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614fee10b4f95---barajufofidisoxa.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/46722180055.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/pemijalejasum.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/93684357414.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/10382601987.pdfIn PDF document text
    • https://medius.sk/userfiles/file/xinipibotepenafa.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/gotesimokuketudu.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/86562358943.pdfIn PDF document text
    • http://sharmtocairo.com/userfiles/files/magajasopifosonip.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/23896255854.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b8cb8b90---sufim.pdfIn PDF document text
    • http://findusafranchise.com/files/files/wibizujonisepalumonome.pdfIn PDF document text
    • http://keitbg.com/images/files/26565066978.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/66004589352.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/74937542363.pdfIn PDF document text
    • 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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 10916 bytes
SHA-256: e03c94045c718aacfdd601c2657a72ab02e38b66b88bbd5fb49f6bad7b8bdd31
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 17684 bytes
SHA-256: bc208b8164e8294075475a78bef832d2c282411cd8f5df5db2da03694a657a94
font_02_sfnt_off000136fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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