Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e0e69e71f5f1cc1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-15 19:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 397f70a3dd90c852bf625698049039b0 SHA-1: 854536654eb7075798316507e650a7d5c374124d SHA-256: 8e0e69e71f5f1cc10c1c9a08e3444be2a1381bee843915408000523f9dd2fcd2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the 'link farm' heuristics point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://archism.ru/uplcv?utm_term=calculator+lock+app+hider PDF link annotation
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/21690595802.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/61869292688.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/vinogosip.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/75398769698.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c4fb95842d0dfd6cab1f0f0eda90bd1c/77117777882.pdfIn PDF document text
    • http://netart.hu/userfiles/file/vepumore.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab0d2d7a2---sizomibuganugot.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/barujidibixodon.pdfIn PDF document text
    • https://www.ewdel.cz/ckfinder/userfiles/files/25947022784.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/4f754f2ebac5fa542811661fe61bb890/78809654888.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612efffd010a9---799276461.pdfIn PDF document text
    • http://vrajacreation.com/uploaded_files/userfiles/files/nifexu.pdfIn PDF document text
    • http://millecolori.it/images/file/97066814040.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/suwafutuvuped.pdfIn PDF document text
    • http://afslab.asia/upload/files/tezibejaduvesimosalom.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/82244070508.pdfIn PDF document text
    • https://windsbs.biz/files/file/zozagoxomobabum.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/difojazuna.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/fiteka.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/senumovoxuxukali.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/31781687357.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/wilamodoj.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/tetitizeg.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/18499223014.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_off0000b6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ceca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECA 10564 bytes
SHA-256: 3898882f50aab4b47156b798b5bb49e2474b3384a617d44dca87c7b9eed90a89
font_02_sfnt_off0000e703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE703 16348 bytes
SHA-256: 7e8fe35c33b3208e3539f796bec07730a708aec4083ccbef2adf4b9fecf2c424

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