Malicious PDF — malware analysis report

Static analysis result for SHA-256 984963a71bf8d3b5…

MALICIOUS

PDF

102.4 KB Created: 2021-08-28 21:12:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bc72237152820ad2cad6d7b6bc8f3aeb SHA-1: 9b0e50b625b40645b7d4f70e93c9c95fec12520f SHA-256: 984963a71bf8d3b5839449cf25edcf0fb106cfc23a8c5eda37d8947918812be4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, directing users to various websites, some hosted on compromised WordPress uploads and others on disposable domains, under the guise of a government inspector summary. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest an intent to redirect users to malicious or phishing sites, likely exploiting user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ruoumoc.com/upload/files/94543355590.pdf In PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/23673916283.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/26483900732.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/nulovepazefamolawop.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/gijujupujubukorakuw.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/35277659255.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/wanigafivisolikiwana.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/peguvenanofut.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/lifivariluvokipik.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/77279156541.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/jixegul.pdfIn PDF document text
    • http://merwepizza.com/upload/file/73511474509.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/014af46228c43035eb92868a21734d82/jamesadipanelup.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49121ddd12---64205394984.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/wuwozitovabizotiki.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02d651b83b---bejawuxaxivo.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/dikofikasudipakebeli.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099a97fcb9f5---75826122199.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c662b5f07f0f868967c5a032691399d7/xoronaridifu.pdfIn PDF document text
    • https://capecoralliving.com/media/file/jifofezagejonaxaf.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/xezipawuwe.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/najegezosepolubobikolikak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=government+inspector+summary+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_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 11052 bytes
SHA-256: c621101af24c1af34b6f632df0294139887798e5aa8e2f111124329638ddb583
font_01_sfnt_off0001428d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1428D 18624 bytes
SHA-256: 9e3cb266d08d1820e8ef7ea1d589ea069e71b28b669062f09848e842096c5882
font_02_sfnt_off00017288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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