Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be5ca53c47c1b25…

MALICIOUS

PDF

77.4 KB Created: 2021-09-19 06:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 15c316d302d4bddde516abfdc21fe4dd SHA-1: 6a3ca865aeb3836ee6145ee1c8d751074b1a3848 SHA-256: 7be5ca53c47c1b2563c6af52b4322c8037c937aab6fec65db3a5714565ce5023
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting. The PDF's structure and embedded links suggest an attempt to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/nederokugesorurunufi.pdf In PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rujisatejiripupuzo.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/14760005279.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/gexema.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/xugobibomop.pdfIn PDF document text
    • https://norservis.info/files/files/21179084984.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/kowurigeguxawoxiru.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/31834818031.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/fawusavututisopeb.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/54021903917.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/vaxuzezagefupofarol.pdfIn PDF document text
    • https://ksuskalology.com/images/file/pilexuxenetugegojanat.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/vevinenifukofigunemamax.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210916035009810.pdfIn PDF document text
    • http://slovoveri.org/userfiles/20919485416.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/6699768153.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0de7ff7b---85274234939.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/57296864779.pdfIn PDF document text
    • http://wohingltd.com/userfiles/43901586167.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/63697001876.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/ronugogugaguvaw.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bea07c10569b6c7c58991fe64380444b/pegobawuwu.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/21708467219.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/96084684395.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/44403019691.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/536e1a0b344d76a8e8a88c68c3b1fc36/rapijefefujapik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=gta+san+save+file+androidPDF 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_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 10452 bytes
SHA-256: 744f3ed00a7919c3adeed9ebd982ce88ee7811caaa52145d99f9ac24c27f5363
font_01_sfnt_off0000e325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE325 17304 bytes
SHA-256: eb8627b518a31d0aac2c57551ea10044288660e150e52baf9a404ac83e33aefd
font_02_sfnt_off00011013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1