Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd302c2d27e3854…

MALICIOUS

PDF

97.8 KB Created: 2021-09-04 14:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a255e921539d21f338a817e8c48b5f72 SHA-1: fd71545d1d3e3b28947f684a447a156e7e96131b SHA-256: 8dd302c2d27e38548c5a3ef3836d61d536f5b3a83a93b9818a0906edce01a8dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to compromised CMS uploads. Multiple URLs embedded within the PDF likely serve as lures to phishing or malware distribution sites. Although no scripts were explicitly extracted, the PDF format can embed JavaScript, which could be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/49400c2a9f62fdca44a561b9148bd35c/26254015330.pdf In PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/strqvi3ub6hi2t7snce4f9b6lu/pamajuwepusavuxaxejelim.pdfIn PDF document text
    • http://shesob.com/file/files/rujukem.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/lepowazumeporumib.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/933067f66d31f11eed66b435d50f564c/nataxanudofe.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/if82p3fufnnt5ip5v5bqu4th77/gotipeluwesojubirasor.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/eee1d112586249dbb01bfc9b643150c4/xatenizuxedezoki.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093de35eea6d---72209040734.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985db2082fc---morofajewike.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/xegikade.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/fijog.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d1deca5d0ff---93784145329.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/g9vr43vjj4lpj6621ebm6vs895/lifezonimuto.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/xibirezezigaziwasugek.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744b6a1e7b4---91516533580.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160780ca2126de---vijuxofojiwonapokimopuf.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/mibifudizeki.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f85cc0c59ecfb6523f657f1f827c8181/86197439603.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/3uegngfcq677rvm9m8uva86nl2/noxuturogemazepugara.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210827091418.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/812a3c9dbb880960804566ef0191da00/60046197037.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/816848382ff9bf90a09fccfb45afb500/tupujolojusojov.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/gisizolowazepe.pdfIn PDF document text
    • https://digireg.sk/upload/23397835082.pdfIn PDF document text
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/45363042477.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=lands+end+catalog+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_off00011638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11638 19912 bytes
SHA-256: 0b1a17e8aa1476d048b5cf1e70f0f1d7366d7d6d62f1fa3814e445b667d0f2c2
font_01_sfnt_off000149ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D1 10560 bytes
SHA-256: 2440ceb08d09b1eb3bd05391eb3e350dccf3503abdd99cad2c72d812dc62bf1e

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