Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7e6930d06a5b17…

MALICIOUS

PDF

81.8 KB Created: 2021-06-28 09:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d4f89ab2e7116151b7b8f00ea3c6a04 SHA-1: e950baab843a1a7022a064fcaca95926d2a7ef1a SHA-256: ef7e6930d06a5b173ac5b892a53ca6d49ed93a5e2ea4dee27dd52066c528fcdf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=about+pug+dog
    • http://modnyi-buket.ru/uploads/files/18483963353.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/ffa7fa814bc158a8e15442c215f7442c/jozapinenavukisolizi.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ha6lf4gjhq1cjcq7iuoqrmedeo/guletivevasata.pdf
    • http://axiomestates.com/userfiles/file/33740988750.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9383066d4516f350d7eb2f31cb538432/33127967259.pdf
    • http://daiichilogistics.com/uploads/news_file/lanudojugujatudetijezuguk.pdf
    • http://jucal.es/images/file/86998948065.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/363e1d0f026f1d8f5474892ef92986d3/jilivum.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f27563a53---44525440945.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160848608e9d5a---44394025810.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/5fad135a69b63d89f5b245d5292bbb86/10645045983.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830d740be42---15447672568.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/95fbce4f06ec9e18fd4c33639622bb55/46669793375.pdf
    • https://hitpoint.tw/userfiles/file/56077266414.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d9d13445a---luteteb.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c92af144e1---kazumomegevarenupibet.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/f72n6jh3mav7oocf91a2mnnmmt/29469550453.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087db0419ec8---27227141168.pdf
    • http://gialtour.it/themes/userfiles//files/jonurunimikimodimupus.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/un3tlopq4etmqeifd2pmlhhja3/9911996368.pdf
    • http://autohondl.cz/userfiles/file/xuwixumawomuja.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160966eb7f4228---nonijob.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608178ca31c70---rogifagoroburisofezu.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf37253f86---meziwepadiw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e085.bin
d6954e13cdec9d716f966667268e6889a0bc218945c4f84dd2ca02ab7e60c834
pdf-font-stream PDF embedded font (sfnt) at offset 0xE085 9984 bytes
font_01_sfnt_off0000f644.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF644 16792 bytes
font_02_sfnt_off00010e56.bin
168ab838b61b6d76b9919132ba6cb80d7ebe339e038228c63f02c27398143580
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E56 16952 bytes