Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ccdca42ef1d0d6…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 01:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05dd7a59615f8966dfcc83f2920fed59 SHA-1: c2b18219ca1103e99f81986398a3ff8510f049be SHA-256: 74ccdca42ef1d0d6541ac714d8f1985f11d485c7ba122d3ec467ba7693b14c14
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bedrucken24.de/userfiles/file/guteler.pdf In PDF document text
    • http://asbu.net/uploads/FCK_files/file/66155589014.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/rudodizabutunerurevi.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210904_200709.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/wojede.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/wotefu.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/9855074500.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/vebitukonafomulalam.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/17898691547.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lp5tvlrgu6e0blad901r40kkuc/neruvojunereporu.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/1937876434.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/wekeximobepute.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/c16ovdi0buekd0kvbin47grco7/gugoputevatiwab.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/rexiziposopexiteborakeret.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/nesigowiguxo.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/tupig.pdfIn PDF document text
    • http://millecolori.it/images/file/mavowokofexulixifuvesud.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d9d92a3a44244032fff19a8d01a89164/7879527604.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/kezesisogeviwugenugu.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/bakegiwufukawasax.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/umnqcve10vf749djo6d10qitf7/10450886834.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7afb13243---42205247888.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/xamujatodofotibexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=mortal+kombat+game+free+download+for+android+mobilePDF 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_off0000cbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D3 17648 bytes
SHA-256: e2dbfd768d45cada624a3f3bf8b96d868ec96c163947e44414210d70024c7e7a
font_02_sfnt_off00011129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11129 10840 bytes
SHA-256: 311828d3205ced5c28a30d60f4494d658d24a498a6ae8b2ebb5e9269352f28c1