Malicious PDF — malware analysis report

Static analysis result for SHA-256 e76a56b1894da531…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 10:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20479d5d974f484b8e3ea3a7cd0b4038 SHA-1: b4e0c97dc10e64478936f0e19660472ae90b3481 SHA-256: e76a56b1894da531108d16c64c0c461cbce4e9cbc8d8159d8494e2a8b614283d
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to direct users to malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://etalentlink.com/uploadfile/file///2021091215571310.pdf
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/14600409613.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/katevowu.pdf
    • http://mnogonomerov.ru/uploads/file/gowezepemiwodafogapuraxi.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613747af7ecd5---3473537327.pdf
    • https://coolinterier.sk/upload/files/bifekokaletikika.pdf
    • http://studiorapizza.it/userfiles/files/bevibaw.pdf
    • http://heninrealty.com/userfiles/files/dijoboxelubunifo.pdf
    • http://graczeonline.pl/userfiles/file/65918145314.pdf
    • http://dubilex.com/userfiles/files/23458506325.pdf
    • http://80tner.friend-match.com/upload/files/91280881801.pdf
    • https://thegmsbihta.in/userfiles/file/39251482258.pdf
    • https://www.amata.org.uk/ckfinder/userfiles/files/6169763094.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f363807f40de5c8e1fee7418c9949880/xinidisinife.pdf
    • http://dealershop.es/camarasegovia/userfiles/file/kudoduf.pdf
    • http://hanleyresources.com/images/63737073492.pdf
    • https://ww150007.linebot.net/upfile/files/20210921105914.pdf
    • http://tangneylaw.com/admin/images/file/janutokusulibefezuvuk.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614261ee6d768---kaxekelagijusewereti.pdf
    • http://residenzaeden-albisola.com/userfiles/files/nizenewizizivim.pdf
    • http://vansuloi.com/uploads/userfiles/file/49629946683.pdf
    • https://helicopterleasingservices.com/userfiles/files/1086742185.pdf
    • http://smolninskayahotel.com/userfiles/file/96202577107.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+hide+an+app+on+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 16792 bytes
font_01_sfnt_off0000f8cc.bin
a58c948185631987ffc7931865a580270b9edf1a50d2d1bbab2426620b9dac1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CC 10252 bytes
font_02_sfnt_off00010fb0.bin
4bc5a0adb818390fab00397b64756e47a0a0a0ce28ee8e6765892c466ff5ac3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 18932 bytes

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