Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fed41ccfe625c0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-02 01:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: caf5e476f19ad4387e4c98583731dda0 SHA-1: 07487957ca182cac0501e14ef2dc4d35b39fe232 SHA-256: 08fed41ccfe625c02e2417d37d3122af5a678a6a785e0746e94c044a6d5b3ac2
164 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on various domains, indicative of a link farm designed for SEO poisoning. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure to download further malicious content.

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 https://snoman.mb.ca/ckfinder/userfiles/files/favisowipu.pdf In PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611e38d62db0e---viloberupilakazofot.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/jixiwapa.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608952506d0ad---sodikezigetomipebex.pdfIn PDF document text
    • https://keongracun.org/contents//files/98998872974.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/13850392385.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/91168450547.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/25850094972.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/2404557805.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/4631266749.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/on43t88cnos2php2n4s6q3lth2/22862570683.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/85586971380.pdfIn PDF document text
    • http://rc-modeller.se/images/file///83212997963.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/zewuwasud.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/4086553452.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6324e6994---rolokefefefilokitidipi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ba6a16fce---gokipe.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/vijepekakufudobew.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/31999245591.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7fe30a8a---foruvefivedevawaki.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/71cc3a97a74c7ab1b120426891247c9c/pupulemarovagotepe.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1621843940.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/16639133028.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210706162557693359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=bsc+1st+year+maths+solved+question+paperPDF 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_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 11312 bytes
SHA-256: fcf53fdb058ccdc9616b72844c0089b48c3c7c06b0a241da5bd281943a1ea2cd
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 19712 bytes
SHA-256: b911876731e523bea50e56092e188a71f982a9fdde090629fd51a2634e1f3ebf
font_02_sfnt_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1