Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b855fba46fac06…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 12:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f690ef009e977dd2b803829c57279a3f SHA-1: 1d88dfa90827591662a8fe7d36ccbb93bc184cf6 SHA-256: 10b855fba46fac0614c6abd0ada52f218f6b80776e68aa60e353f33b22edd6ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised or disposable domains, likely intended to lure users into downloading further malicious content or submitting sensitive information. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using such domains for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://janjoling.com/public/ckfinder/userfiles/files/11629488795.pdf In PDF document text
    • http://flynewsletter.com/uploads/file/nisoximalujozizaxu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/196e1f0d042633ad016341de1e69b42c/xozuvuweju.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/90875693883.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/925eccd54389757d961200b2819e92f4/wiwijusi.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/josefaseginena.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/f79ce0b21e2cfa8daad5579538aec1be/9119747295.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/sefutap.pdfIn PDF document text
    • https://tekartltd.com/upload/files/87836629517.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/wetumuposoxudulawujuf.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/bilupigorekisukiv.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/51265236317.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8c8a0cf6---lafujawesujoxujodime.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55cd4e38b1---32457785794.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e7d88513---tadeteserapunexumutim.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/53642128758.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/mujesidasuvabofeleva.pdfIn PDF document text
    • http://hkt-optics.com/hkt/images/userfiles/file/zawelipigerotujenowaxovuf.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/vexipewususelovelozelix.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076a0083a264---rolaxifaxobepolepekoru.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/ramonulegi.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df4762ef5b---61641664542.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/61270358616.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/paragojebewibo.pdfIn PDF document text
    • https://memoservicesrl.it/file/30688042423.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8feb54660---55775237194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=enfermedad+de+crohn+pdf+medigraphicPDF 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_off0000da51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA51 18988 bytes
SHA-256: c4c3ed08b2787d47a851a9d7ac3af71346d99ccc123acc5dbc819f9bf35f748e
font_01_sfnt_off00010ad4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD4 10740 bytes
SHA-256: b22a2041715fa830001ccc84094f699f3b9f9ba2430720cdadc8dcac883d64f6
font_02_sfnt_off00012305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12305 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.