Malicious PDF — malware analysis report

Static analysis result for SHA-256 d84bdd920eb4e523…

MALICIOUS

PDF

90.2 KB Created: 2021-07-14 08:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 424fad411914cdc394cc7ebb31b6c358 SHA-1: 4c8dcc6039bbc4a4594b92e919cb195ebcedfde0 SHA-256: d84bdd920eb4e52348a1e189fec7849058ed98d4894f208cf312bf1a9e7c8f7b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=catch+up+day PDF link annotation
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/7e79697311320b9ffb3f0cadd0a3df93/dufuton.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cef238faa---tewibovemaguzamelabupiv.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/kimetibatizimulipilenu.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/48929923561.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/mubasutagunezagut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b556bd63a2---lupuburizuvuvo.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/82265714913.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/78929110949.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/70152649907.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/77281931176.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/gimewedufozogorexagopin.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/46f959acdedb2532924655d8b85bacf0/76943438353.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/a877e9262c416a673c0d70c644b1def3/wamaruxozutilimipuj.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160bc797bc3a0d---nitererizisaro.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/99820205937.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e629f03967---20927157569.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/nqa9o3hfhg3vu8ecb83bgr9pk5/rivenidoxeriwixedesudefe.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c30772fb1da5ff4461ca1fea0ae6a7ee/16662161489.pdfIn PDF document text
    • http://iltorg.ru/upload/file/88474204361.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/sidezomikiv.pdfIn PDF document text
    • http://studiomarcheluzzo.it/userfiles/files/87133425865.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a758ab75db2---kevekez.pdfIn PDF document text
    • http://quaint-house.com/lazemumewuvagu.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_off0001019d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019D 16776 bytes
SHA-256: 9fda07a1e2e5befe8593b5ad1355d4662c737d40dce1712fde0954515d6c91d1
font_01_sfnt_off00012d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2A 10092 bytes
SHA-256: 6543f50c1c7ca321c3e037c7f44738501cba46f7b9650eebc334cc5d25a281e1
font_02_sfnt_off000143d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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