Malicious PDF — malware analysis report

Static analysis result for SHA-256 31a9f6637fd748bf…

MALICIOUS

PDF

113.4 KB Created: 2021-09-08 00:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: aba75417ed3ce80a98d8d88666f2d494 SHA-1: e091e83d328a8618e88dee2d80c09f88a95442ad SHA-256: 31a9f6637fd748bfd14ddac95fc975e203451897fd98fcc3c1448bc8ff591023
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload storage locations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious sites, potentially leveraging embedded JavaScript for obfuscation or further redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/43163325585.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/28c94ed21495f71d42a9111a33a209d4/zejumituzademadovagofosal.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/vuximor.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/80447066170.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083efbd64ad9---4270849026.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/goxuk.pdfIn PDF document text
    • http://asustainable.com/global/file/zododexosazitifesoxujo.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/18663469673.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/86f7ffb9a5e591414902b3e59ff51992/pinawutakeziza.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/13144432929.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/vuvanabana.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/63428503935.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e64b06740---91685740709.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/didedaretaj.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/pifebisafivabanomazamufot.pdfIn PDF document text
    • http://macphersonproperties.com/clients/876251/File/40697649190.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb42a476908---66555263129.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/07ca6b327ca59ece54e3a5f3b7fe7f8e/fexufawoginuzudinexi.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/zegimi.pdfIn PDF document text
    • http://bastola.org/userfiles/file/rubakipikazuroraramo.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/tilevepodedugosebazu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7a50d88b---49589783670.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9286f5219ab28885924ba2fe7fd89e6a/57545580094.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/55555241594.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/12550184488.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/95388330797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=2012+aprilia+tuono+owners+manualPDF 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_off000154ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D06 10796 bytes
SHA-256: b5fb4f25511161dbe110ff1c275f70096b86668be473c4c63751531d31d29f77
font_02_sfnt_off00018602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18602 18960 bytes
SHA-256: 070ef76484d24b78dc39aa078e048b61e2c95276523086a88dd6e5584c6b4a6a

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