Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76b4378852b93f0…

MALICIOUS

PDF

83.7 KB Created: 2021-08-24 10:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: f22955bb87d2ae78a59160b8bbb7517e SHA-1: 8c8876ecc661e3672a9d5206fb69e618b981e328 SHA-256: a76b4378852b93f0fc2c0b32e35a9842c7e810408706af6801c5f0c3c45b543b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations, hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ad1e032a2581c6597c5e2c03b9d2671/luzabulaxagev.pdf In PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c72bfd2ae52---wotaginen.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/c721e395872fb1dbc31eb367145c783e/32802839875.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/pelazukasibokefemuz.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/95754bf2dd7e2da4645adcf8e373957d/91060621724.pdfIn PDF document text
    • http://autovoda.ru/upload/files/vubexaxog.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf6d5e73b---fumozisezegokogaxedib.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/pebubujapuvuvefefejegales.pdfIn PDF document text
    • https://loctra.net/userfiles/file/79502748124.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/wibofokolado.pdfIn PDF document text
    • http://isvpro.com/custom/files/49325085483.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-18/20210518072718202508.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ede93739---39383039423.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210607_76B363B95218BAD0.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/78637224202.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161164675d5767---gipojiwepexutega.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/5rsbbb35lffjd63hedi8j6oe34/9521001140.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/00615b4758f2d3217868799ac78578c0/vusevuxozamumuzedolegu.pdfIn PDF document text
    • https://aedwea.com/upload/foto/bivilagotidozef.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1a1a6d994a43e7aa08ec148b8cecf0ad/48426310518.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/bskjdlfgev2ifrhtukm8e863c0/vojonirorasiwew.pdfIn PDF document text
    • https://btegypt.com/file/50347918978.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd96a0e93---ratekulovivuwaruzomejere.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ikiupnfjrvfi4oeevovc7j7ngj/xemopetixunaxekiwuwiguki.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/lojikuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=adenoid+removal+in+adults+costPDF 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_off0000e299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE299 10676 bytes
SHA-256: 8e1d3d903bc244e3dc435dee4b99ffea739cb4542fac059f38fec4f5d8e9ca34
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 17244 bytes
SHA-256: 1c57ae8d9494f461741fbd05406fa02aae90372529102e1621bb504473188eb4
font_02_sfnt_off000127de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1