Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d37f6fd7c03178e…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 12:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: bb882ae029bbb1899ec961c5e6f6a200 SHA-1: c135ab927058a403e266ea03173ae4a05a95f34a SHA-256: 3d37f6fd7c03178ea42ebcecc36290b6488ceae0a54b7404bdaa03919e86df62
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links pointing to compromised WordPress sites, likely intended to trick users into downloading malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, and the PDF structure suggests it's part of a link farm designed for SEO poisoning or phishing lures. No scripts were extracted, but the presence of external links and the overall structure point towards a downloader or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609443e31618f---jepoxebanujowef.pdf In PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/a290d645a0918115b7346552593c0c38/61667101898.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/t4ov9npsr7bhvrjs96c2eb82u7/luvowuxef.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/nosiwafedutasogupozurileg.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/52888252191.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/a59948784539876a3e72d25c96a90460/sagepetabo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5d29a10db---3396167080.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/soxiduwugedufakasaturo.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/nfve4oqsr2dbl0m1d0gkqnb1nl/zoneluniluvafenid.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609498b0c27b2---kataverefujeronezus.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/53088976912.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/jajofudamijavejuwatox.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160abc936bdbaf---17870038993.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a9868910bd5---logajiludir.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/50584395551.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076e87261fb9---86675077790.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/4ccc8e59a230d196c41a98b21f7b4c9d/petubadukegunij.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48174e954---gasujiji.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc4673dc4---63777627073.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e9d5723a59b81f32e73640b42da1b7bb/87192153671.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/6391760100.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85764e4745---14403780641.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee8c09e8a7---1545609847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=abhra+keyboard+download+for+windows+10PDF 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_off0000f707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF707 10940 bytes
SHA-256: 4d2aa5cf76be3145cd21aeaa6270c2a550fd861440232acdfc3f6ebfa3369313
font_01_sfnt_off00011068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11068 16616 bytes
SHA-256: 1b722190fe0f7365b56a014dc0c929c88d3fd3cd9b31dab6624e1a13463ab118
font_02_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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