Malicious PDF — malware analysis report

Static analysis result for SHA-256 67e354d23a2ad134…

MALICIOUS

PDF

79.3 KB Created: 2021-09-17 05:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f5aeaedb289295325e0d4a9ab56c5ed8 SHA-1: b72a96a28e12583ccbdb4aae14cfe52c5ecd7198 SHA-256: 67e354d23a2ad13434c9c0db22c7e8e596f25a315ac28e9262a67ef34ee87d62
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm pointing to compromised or disposable hosting. The embedded URLs, such as http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c63d91d0---51439115043.pdf, are likely used to distribute further malicious content or phish for credentials. No scripts were extracted, but the document structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.medicellbank.com/userfiles/files/20202354987.pdf In PDF document text
    • http://citranco.com/users/files/tajunatiwu.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/81401846347.pdfIn PDF document text
    • http://fourfoods.com/images/files/virurobifidatod.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/3570543947.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5273bc6ea47b47a44541806a745aa377/golavofi.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/48161352217.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8082de7084f30e8535d11281640c1bfc/84045630523.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/57932294305.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/80358018779.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/gisiwesajekavutuzofixik.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/34788598431.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/93694630096.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/talebavir.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16138ea47a76cf---75409443567.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9c63d91d0---51439115043.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/vumawitukoxuji.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/kugigirajatizakudo.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/87103413198.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1631335842_39554bfa1d.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/24685075293.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/85150902357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=chemical+reactions+worksheet+answersPDF 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_off0000d2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10704 bytes
SHA-256: 8b65acb19e9da05b399153cdf43b5901b4551d7b7d188f56ea1e3b44e26c68f0
font_02_sfnt_off0001036a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036A 16892 bytes
SHA-256: 3edb762b386fa8584252d832d71e30f35e774c7ce6a2a4d445a86c6f0c79d5ff