Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f899e0be31f1c6b…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 12:03:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05442acd7df000f8814ed5d3b77f10fc SHA-1: 4c1c0ae91df53e151538016dff91681b4783ebf3 SHA-256: 0f899e0be31f1c6b59b6ca1488257267d6aaa68349602d54f175a9fa6463248c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that function as a link farm, directing users to external sites, many of which appear to be compromised WordPress installations. The presence of these links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://infrive.ru/uplcv?utm_term=symmetric+encryption+definition+pdf PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b45e210d2acc4e947ffd223bff1cb11f/zidewakegewitami.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/57395843740.pdfIn PDF document text
    • http://insightonafrica.in/userfiles/file/magofozarosapakubuxex.pdfIn PDF document text
    • http://clarasonic.com/upload/file/8194912230.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/taluzakeviragipotede.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/70ce0n0lgaooe7g99ia0c3hvfc/29888110139.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/61097914596.pdfIn PDF document text
    • http://rld-carbon.com/file/rokiwikifasawoser.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/87652539354.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/66ea25d7b514bbb33f2736d1300590df/jaresakazomiz.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/vovigebevumufibajijev.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/pukiko.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/fulonimap.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/duregedoranobulepa.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8106c89fb0d5ba8f9c1300c633c33cf0/75940306686.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160894ac612713---mivavadogejedigibi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6b74559925700e87320b3b6bd5b5284c/76530492541.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/4643485438.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/tujirifunujekoxopetovos.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/97c790a5bf0a6e7912190f05b1975269/39551289839.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160793e87ef82d---67555377359.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16086f5aef29f5---27279745428.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfacdc56aa0---zenitomilof.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/ef18f22dabe23ba9141c9a21ad221991/juwuwexile.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_off0000cb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 10592 bytes
SHA-256: f710dd641420718f3d05210218709fd6bad36f00138d35689b445c0aa87a2fc3
font_01_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 16372 bytes
SHA-256: 2693dc0d0c4abf920145c6d70a2f670a250e215cf5a8461e8894f077882622a1
font_02_sfnt_off00010d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.