Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ceba0c95271787…

MALICIOUS

PDF

93.0 KB Created: 2021-07-19 01:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 33b6fe3a250cf6ca859a58bc719c60d1 SHA-1: e4ff736495bf48648cd7521ce823f25b68f3166f SHA-256: b7ceba0c952717870520a5ba3eb7e4779a15fd15cf5550b79c2227534c6fd628
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a sophisticated attempt at obscuring the true destination of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3c99463d3---43979296976.pdf In PDF document text
    • http://funperm.ru/content/file/nubegeragowusebofav.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da41651ac5---poletazujedujudokedajizi.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/68781285443.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/abee5e0abcb820dfd04ce8fb54d4080f/gilirorodow.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/57680892526.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/44673254456.pdfIn PDF document text
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/45084360961.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c155d3f3704---99313635180.pdfIn PDF document text
    • http://imaginove.eu/data/Files/98389852988.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/38209902600.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d8ab7d4c3---sujupanoraku.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079b97eb6c0d---41987694282.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/dututisawapoxudu.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/53045465664.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/8hb8b709vre96b1r5ddlh82gg3/53643032161.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ae7364eca---57199723988.pdfIn PDF document text
    • http://trhs1966.com/clients/b/bb/bbabdd843433c1cf4d3e80624837507c/File/70010796699.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a83cb5687---22863653599.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/nedovagosilasenefeloju.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e99273b50544553727535ce56386229b/nujebiberejifudakidub.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/dazipujulalagunogu.pdfIn PDF document text
    • http://nktrading.qa/file/files/80131667667.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=a+walk+to+remember+2002+full+moviePDF 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_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 17472 bytes
SHA-256: 9cc151a1bf754095f05e255fd12d2ba168059ac5857a59201c5ab40a37147df4
font_01_sfnt_off000133c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C6 10808 bytes
SHA-256: b7180a338d96f52b6396081973ab96616cbf5218d904f38d4770531efd9707b9
font_02_sfnt_off00014cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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