Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dcdf23b70c9743c…

MALICIOUS

PDF

165.0 KB Created: 2021-08-17 02:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8ced4a48107ada4bfc54336891f9ebe SHA-1: 9bd407be5d119d0bad5afb1b6821a8d178e4be03 SHA-256: 2dcdf23b70c9743cc2b15190599af5c6af10b84e721cdd0e6a64234495950bd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites utilizing form-building plugins for file uploads. These links likely serve as a link farm to distribute malicious content or redirect users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8035

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.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610095402f06c---48133310676.pdf In PDF document text
    • http://influences-vegetales.eu/assets/Image//files/91754065007.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/u40m178c7vcfogr9dnu6cuhevg/94516393122.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/wibujijasanewabisawesola.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/0ad59335522f52d8bc930f7ab9bb1d98/vakozuvabutaxonuzeso.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/57825881110.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799e83385e8---xavilurixowalu.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c306901cae---veturer.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/3959755169.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b4c985fec---27527014124.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/2a172b58d23d4675b7d3c529be42f8df/vilewe.pdfIn PDF document text
    • https://hsse.cl/files/78445021543.pdfIn PDF document text
    • http://centrons.com/uploaded/file/102338192160e04cfed0d67.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/53376145323.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/xamafisosa.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06aead465---23677427366.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f574a266c40---80579730018.pdfIn PDF document text
    • http://grabnerestriche.at/2203859053.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/jagigufujobukulobatemib.pdfIn PDF document text
    • http://gfzgt.ch/upload/file/18227974447.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/gelupibofiz.pdfIn PDF document text
    • http://lecostationery.com/files/file/74915913168.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/bd891c74aa9dba414acee94ea68d2f2b/82575497977.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b291ea96---vobox.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0c1ee236---5510680950.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/nobanupafofafadejebobon.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-6-19/20210619130846800564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cantos+lit%C3%BArgicos+cnbb+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_off00021df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21DF4 21364 bytes
SHA-256: 47d35428243a368da27e795b3d79d8ffd185ddd5f354c095767d967dba2af9e1
font_01_sfnt_off00025225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25225 10952 bytes
SHA-256: b5704a4ea143c8052552314adcd3d36eafd038c238a83e90de5da1c31e8145d0
font_02_sfnt_off00026b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1