Malicious PDF — malware analysis report

Static analysis result for SHA-256 400f9bd35057c13a…

MALICIOUS

PDF

92.2 KB Created: 2021-09-01 16:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53d536a5fcbdfd04c231d853ea6cd95e SHA-1: b9619ef2914f799fd6f18b72b63db242c41b8248 SHA-256: 400f9bd35057c13abad4f78d1ee03dac2d7953404c983cdccc2c20a215c3e5d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://knipia.com/userfiles/file/zowagitej.pdf In PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/m611s9dpg9quig7dhkq7f29650/48266420714.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/tuwofewikediwawigudegax.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/wajogivex.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/f9k5p75oga6a1p8qgva22oc320/91072931003.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/29250986687.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160864fa93540c---gosawudowasom.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d873889e6de---junuloz.pdfIn PDF document text
    • http://designgaleria.hu/userfiles/file/98834055047.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/sitovubepaxebizuxo.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/33368667700.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///84997013024.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/34938891382.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/03650190f388dd2ee64550cbf34a210a/lelevutobas.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/toniwoboxinevelinad.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7891df246---sojixe.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/bawejomudogetopavi.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/269b9bcac31834c187cd22f71d37e899/92273698863.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/22d87cf660f4c121eda02e9eef9b08ce/depalenu.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/18034674759.pdfIn PDF document text
    • https://baptistfriends.org/media/77682425860.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7385c6b043---gotanoguviraroneva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=best+classical+piano+songs+to+learnPDF 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_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 18116 bytes
SHA-256: d5d8757e8fe43a7f9b721400a2b7d5d6eaa455c028e4ef638706c78e87ee1af3
font_01_sfnt_off00013200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A17 10600 bytes
SHA-256: 811e9a73c7c1d976b183a128907d69166dc05eb6a75e545fd1d2b2edfb8d2221

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