Malicious PDF — malware analysis report

Static analysis result for SHA-256 02381a6edd586407…

MALICIOUS

PDF

90.7 KB Created: 2021-07-05 14:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 86331efd639a4b8745a761f28bcf54ee SHA-1: 54241ff3f1dd161a9d37053b38692e45ead73d55 SHA-256: 02381a6edd586407ad99f84a2338be41a3c37f2cc10d8a0b7769d1a869f39cbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing campaigns that often leverage embedded JavaScript for redirection or exploit delivery.

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 http://decamiones.com/userfiles/file/ruwukuvizubevekobizuresak.pdf In PDF document text
    • https://kaptenhoki.com/contents//files/21284697082.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/n8t9ncjvpfhism0bj02gajrb16/36015824581.pdfIn PDF document text
    • http://dhf-china.com/d/files/mumitovekasabupukuzojaxa.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5335218018.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a2adbc58b---83571419133.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/0d35c77c92991756cd09c0ee70820042/70259563243.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/rojulobawaxikixi.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609567ea6c5dc---paxuwinunolaxebufafexiso.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2e8066b8d52adb46726223efbb204227/kojeginifevojil.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/njbn4bq4ncb7ab3l9hedr2i83m/guxonufababuzirat.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160754da33393f---palavekomujabi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b8351e999---46160871.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/81532490694.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/nivemelizev.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/joniwipixirapa.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/sefudexubimakotibataxawop.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/51193401855.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/2476953729.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607467c6b0556---63046690044.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63ba0d67c---rutizenemitubanefut.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9slvbl04menvirpeftjoak61lt/wivibuni.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/mbo5t3fv04vm9ipejirevmj1kn/vadimoduzu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16097815e0dade---69707465350.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/896ogjab01ib75funjrg3m4rr7/78052474667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=driving+licence+eye+test+form+pdfPDF 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_off000101be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101BE 10980 bytes
SHA-256: 16c406740230a7d94ebed6c7be88efd90df9b2ded22f10e0b0cb629e8abfb4b6
font_01_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13320 16376 bytes
SHA-256: f42f08604be5a246152c4941082699cf546e56911d23b93490ecef0b5b66d525