Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c0a0aa4f96dc249…

MALICIOUS

PDF

72.9 KB Created: 2021-10-01 06:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: ffd1cb75a6091748b155cc3604f87c79 SHA-1: 3a7781fe08646332159bcb45cbd057c95eafa367 SHA-256: 5c0a0aa4f96dc24915df22b989c36c22b739e04ca1ae73e862c7c26d22a42803
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=granny+smith+apk+full PDF link annotation
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161475f472b6bd---88147290321.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/ruxakalisog.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/11637993831.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/28090223760.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/24448601838.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/vigekotewabonejokovanu.pdfIn PDF document text
    • http://strandedtattoo.net/file/95166064794.pdfIn PDF document text
    • http://mayjack.com/upload/files/60657476960.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/kiluxujajojumorinimi.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/nebalilemikixizozu.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/34140281449.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/xotusapamipe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/84839a8271c27f25dc482ced91986eff/sujidakodeguvulibilik.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/73408942926.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/kisexiziwa.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/2964563317.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/kaxuduziroratigimoli.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/pawekukuropefutopaxit.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/66725493476.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/jevatajabafejelifumab.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/843990ebf23a509089dfd68a8499f437/1104552630.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/laxeduj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/265f60d665033833c67d960c66f2eb98/bipunimiwufelowiki.pdfIn PDF document text
    • http://adice-area.com/pictures/files/21137135572.pdfIn PDF document text
    • http://klwas.org/userfiles/images/file/30300402736.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/kebavefalut.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/wasizojeburi.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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 17404 bytes
SHA-256: e789f1f370ef0a1e6cf1ba905fb7fdbf33633b4ae08021e833757545a48ed266
font_01_sfnt_off0000e52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52F 10716 bytes
SHA-256: 49c64ed9c746297e8051edac5afd874e06055c60cf7c9da07dd78a19d638c415
font_02_sfnt_off0000fd9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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