Malicious PDF — malware analysis report

Static analysis result for SHA-256 441bfbf9e01f170f…

MALICIOUS

PDF

77.9 KB Created: 2021-07-01 13:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aea0299ffa51282eba53da9c04d4970c SHA-1: b8f918654012b5df2e820dbc025faa4ca8f574c7 SHA-256: 441bfbf9e01f170f09a9de55bc05dc01e7e9f1e636bcb3a23d4c3fbbea5093bd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or redirection attack. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to download further malware or engage in phishing. No scripts were extracted, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://duext.com/wp-content/plugins/super-forms/uploads/php/files/997db5822dd3bb80f12243ea8017dc14/sorapibizevukarafabij.pdf In PDF document text
    • http://technoculture.cz/admin/upload/file/jagobeganuregumox.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32ad6e8507---2210135975.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/c3f5478eac90093c700f4215b5861af4/viximiregimikosuzebu.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/31194348121.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/sksd878tihr5kdbf5onpn2lb77/76534489882.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c29c8b5b1918a0e015a273e8a7908eae/xilanolisidas.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/fdfa2b5d63c4db3658d1a99a43cd5f0b/23014952471.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/54181394786.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/dutisetonefi.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210606/file/nunizesenaxokanimulo.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ffe0b7cc4---82132503108.pdfIn PDF document text
    • https://otartufo.com/ckfinder/tartufofiles/files/sibebevizuxirasomuruzeja.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/69788936460.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079f34923031---zoxubagibusizi.pdfIn PDF document text
    • https://pellevah.com/upload/files/48896331033.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/12602547006.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/gn8ipsleqi2qn4fvn67v0vf7do/wavevuwusaniladisa.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/553avg6n655o1qoas9b7ksq3n3/4656850761.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098914668aa7---keluboxa.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1424d17ea---dajogefasolem.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/10006b23add77395da735cdfeda91b36/gufupuv.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/78ce684649b18bd6cdab57e6f6139a35/pikaruvadekomopukuta.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c37f7543cfe---90790325236.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16090fd8c9f94a---kilomokaloteweribesusa.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8450986d5---78173305491.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608252f0117ce---95125682591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=deoxygenation+of+waterPDF 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_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 10476 bytes
SHA-256: a1f5ca7d5fed29de875b7c250b3d37771397e58b05b88b566ebbbde701d75013
font_02_sfnt_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 16348 bytes
SHA-256: 3823b3f893a666cac6c458fc8ba2f2a873cb7b63e0cf72316354ad846a04e0e6

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