Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f5446205dff0d27…

MALICIOUS

PDF

88.7 KB Created: 2021-08-01 05:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 96d34b1e29f69b0d24a4e964e729cd1a SHA-1: 04b5f66287a2c3a81a66da9bd0784c90354edc13 SHA-256: 8f5446205dff0d27216fb6873b59f2777ccd42136549d97b7e3fa842108cf5e0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/71fe8209d9c81d8cd49665b1563100dd/40688619665.pdf In PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082897d68267---jibobujad.pdfIn PDF document text
    • http://hotararicedo.ro/files/files/juzopononoxemabitunifiv.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079712c517ee---mesofopitujejakezovow.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qbnjjkij8e43ikmtjjl4buucu2/feloziravuwuwunesefiwakav.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/lamitugutusaseluseme.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/07815d7b0944f9cbfb524bda7d025d03/wagikogobadixofiram.pdfIn PDF document text
    • http://flexicourse.cz/res/file/77118042067.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/buludara.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a426e33b609---jefuwofuvo.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/dd07ab062d85f72f94683ec93a4491b1/24685619574.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/majiciljj99nupbguh4j0l213c/mifivirejuvife.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/fixumepi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0bc50c523952470351434c872fdd3a94/ribajowavajuvoratasofu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/jifutipuwazamovebit.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cee487415d9e9923b83557c1675b6c46/79256543001.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869ab8f0216---pugewuwefamom.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e5fc5aa628---ninerilubixevisuz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4da4c2f0f---fapisujuwubizewudizulug.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/25935674963.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/45709734786.pdfIn PDF document text
    • https://alsultantrading.ae/userfiles/files/44543501466.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/90f6eb2af6726ed583e70c210d724a66/masijebesilexewavarefita.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16072c48a358a2---7910497856.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/3f254b2b0c0c3210946c8d8079276ee1/gupivadinomixejitavojokis.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1609666cc29bee---fununifekurepemisex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+use+medibang+paint+for+beginnersPDF 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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 11112 bytes
SHA-256: 383534a92103a19448809484987966577d21bb0d31917a3e4ed4200bb6600440
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 16468 bytes
SHA-256: 38e2c12bb0a4db8f584a2cc933d22c2070a7c301f2e35dabd4308ef4199f9902

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