Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f47ea41abd6d075…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 21:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 97260373437e44bf35d64a0fa0f57e0d SHA-1: 0b66d9ad688f5d7fd8e7441ba9f9fad8380581fd SHA-256: 6f47ea41abd6d0753797e6689d51543782c1e078d231cae494e05f71c13e52cb
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 functions as a link farm, directing users to multiple compromised WordPress upload directories hosting other PDFs. The presence of numerous links to disposable hosting and compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/e33j07gc6stomdc95too9hppe4/80820915163.pdf In PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160781c7d68fa1---tijipimipatodiludu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/cfaa8f94d3ca2f2fc179b64d418aa03d/sifikagipij.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d354e9752f---sojexotu.pdfIn PDF document text
    • http://joyandwowbook.com/upload/file/riwibalorapona.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/96cee053b3f2d2e798f817d978eb5181/1958195678.pdfIn PDF document text
    • http://findusafranchise.com/files/files/78880941344.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/97829892569.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608909b2d2e13---garoxapupobapekiwi.pdfIn PDF document text
    • https://agatanorek.com/files/file/99408378813.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/zupirezat.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52536684232.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/sozumitamaxajixoxa.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/96231313932.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/ea05c0cebb2c3dbacf7b1f4cefcc0f75/52640429257.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/zaruxogagezizeguwis.pdfIn PDF document text
    • http://elm3rad.com/file/68149127457.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c286e09c7---18941782748.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/91137301286.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e9470d2bb71---80300354506.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/lazib.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a2b021b48---murabugasasam.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/5250033534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=functional+textiles+and+clothing+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_off0000de72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE72 17536 bytes
SHA-256: 3f70879b9ce2ee0f65f0ae325e30016a63f20068bfa17ba9afaad7dda8b0308e
font_01_sfnt_off00010bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC1 10976 bytes
SHA-256: df388f91b1d1e2696576cfec03bd3def41b6396055567140c3cba2191605073c
font_02_sfnt_off000124fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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