Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c245264527375d9…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 18:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 77869e2a6f14aecc1e9a258d5219dee1 SHA-1: 7513a22bee116550d6e6393b451fc5e2ed3217c3 SHA-256: 3c245264527375d992d6fdf77cabdb25d8b8c022ea32395f5cb393b11833ca93
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to various domains, including compromised CMS uploads and disposable hosting. This suggests an attempt to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nabsangram.com/userfiles/file/kimapotukexuz.pdf In PDF document text
    • https://hostessima.pl/userfiles/file/lemexij.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/zojolovum.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/66691926187.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/24964178493.pdfIn PDF document text
    • https://ismart99.net/upload/files/sesonovikawegarizij.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744faee818b---31543228807.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/jt180nnl03a5fna1tsgfhagkd3/50344372639.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/53180754732.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160876fcb68b9d---40701757947.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/obb3rfqffltma8ol1su1lnnc03/18553437517.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/t622aaisnkp8bd4aa4mj439o8p/guwabatimevome.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bcf11b9f39e2081238679aa8fc6ca8b6/5136400815.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/fukosajikovavejaf.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jogogidadigidopebuf.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2a250e493---guwilumizevotozedivadas.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5cc2ea5dd745af278d5443667fcc8715/bijotiderasudoxajukixi.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/5875017776.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160be2520b2c57---sevenirelili.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/32067172828.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xonotetigapexipububis.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/viduwudosuzomitesu.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/wewene.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8d57def8f---wipajakeke.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/34713443735.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/vofepesesomizixiteduzevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=paleo+diet+tamil+pdf+free+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_off0000f981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF981 17648 bytes
SHA-256: 5336315ec1f9676c9cb7e0be8886b76c823722a849c10370283565780f0d91c2
font_01_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 10580 bytes
SHA-256: 88a0d8a00e0e36c4d561f74d0ba91289dc7dfa717f5d5e7a02e1f8193c11de22
font_02_sfnt_off00014008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1