Malicious PDF — malware analysis report

Static analysis result for SHA-256 848e41681642ff47…

MALICIOUS

PDF

82.6 KB Created: 2021-08-07 19:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 50f0f66076535addf1a7d895c30b7e48 SHA-1: 76c0814e09881f0592e79de84941c6919d659112 SHA-256: 848e41681642ff472e1c257b76645ddaba8020f1c525c5c4256a6935564bc8ac
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092e4860b091---zixogaxezubirodade.pdf In PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/bisagugukesoxuz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/d5e0203ce8009f20b29379b29da6b6cb/dulosidekisevesejelew.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af81a3e5f83---45563248758.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083403135a5b---mififalujubuto.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/puxeradulolutekuminim.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/60253183350.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/68786204442.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210726_135702.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/ubghhjn1sgn6u7jhhnkdf4u0i5/refazijakanum.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16094a2237b2c5---baforimitesod.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/xotota.pdfIn PDF document text
    • http://healthywithhart.com/res/file/fupususolomedesekifopa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/xagutomasetikozegodisixo.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0843426ef51c0bc6245d5b7335859720/20672364440.pdfIn PDF document text
    • http://ipublicity.cz/data/file/64574423555.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608409aea5869---5311787037.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/kmjgvemt1thsm1dfq7jbs56e7l/kewiseloguvubujedidigafof.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/b55hepmlquavpoh6hj04t515h3/23267363191.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/tonuzegeje.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0e32f1c5---15211379380.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/rawufamopa.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b82d5111---68665522210.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/61654356215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=splinter+cell+conviction+java+game+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_off0000db41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF358 11044 bytes
SHA-256: ca9e83e9fa7f2264e64c1ab08145a25a61bf426380f9282479fcb0b65f6d2962
font_02_sfnt_off00010cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDC 17532 bytes
SHA-256: afc450f083b327312de2b068a685a39736b3e4ecff91faf0238190ca0ee40f8f