Malicious PDF — malware analysis report

Static analysis result for SHA-256 5090a4b37e1b8299…

MALICIOUS

PDF

83.9 KB Created: 2021-08-20 21:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d98a1af9462b15f876a802bf3a2953a3 SHA-1: 1ed2a441204f4bf596e0d6616483991bccb7fb93 SHA-256: 5090a4b37e1b8299a2e190e7d74b43a654c3431f7e3fc07c260b2c4149b0db16
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised or disposable hosting sites, likely intended to host malicious content or redirect users to phishing pages. The document body is unreadable, but the heuristics indicate a malicious intent to redirect users to external, potentially compromised, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://111-orte.de/testarea/cwsCMSlight/media/files/45332716475.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/navilufuf.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/90658442801.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/128ac49315b8e8ca5946a0e840ef6d19/75130863711.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7415eacc4---84441729685.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/76850319418.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/48334478579.pdfIn PDF document text
    • https://hiroyoung.com/data/files/xikibugefezegasazuru.pdfIn PDF document text
    • http://kino-cosmic.ru/sadm_files/sijumaduzuretuxi.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/86714283734.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/39485223691.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/mosidu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/60e02fd7f13060dfe408a10aa45bfe5a/31170351897.pdfIn PDF document text
    • http://hasyo.net/files/file/gafetafilumode.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/fowigamovewejolitalabowa.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/71125206189.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/35452223c3b4850cc54d1de516f92b66/35384774201.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/njbn4bq4ncb7ab3l9hedr2i83m/guxonufababuzirat.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/46282512178.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/9337fdc0931eba23f06f53b9e2939172/93796749766.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bca8974a192---rebuduretuw.pdfIn PDF document text
    • http://lohs69.com/clients/82366/File/14860015610.pdfIn PDF document text
    • http://easy-vent.nu/userfiles/file/nejatoji.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c773e3af54e---64318954135.pdfIn PDF document text
    • http://seamacros.com/upload/file/38561011233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=business+mathematics+and+statistics+syllabus+for+mbaPDF 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_off0000d475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD475 22808 bytes
SHA-256: 872ca91b2eb5e244b06e12bd36f092c59d1e75c418c7946cd55ed2701e4a2956
font_01_sfnt_off00010d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001258c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1258C 11148 bytes
SHA-256: 9eb33c3e51d604ff672f9db5303b8fef38427c6b90924bdbf22f324d0bb0093c

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