Malicious PDF — malware analysis report

Static analysis result for SHA-256 4813b87edfc98c4a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 14:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 248b38864b6a601307bf9a9370905bc8 SHA-1: d29b4e613c2b9962746197f3c07d36027d2511cf SHA-256: 4813b87edfc98c4aca25e66422096e13a0cb4b8606c34a1155b507efb8f5eac7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c81d5fd0---tikadof.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3e613df7c---jirunevegalozosul.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ded6b596f7f---fepogunen.pdfIn PDF document text
    • https://penal-garazh.ru/files/mugojuxavox.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/98865690184.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/30945539387.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/lowebasokowajubibubomox.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/11708646561.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/74ba0adf89e1f796f1132c15486ded08/kubodupimezavasediwoba.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/5f35810cb5a93e249fab11bf9ca16f9d/19963228477.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/ff98a9af715dcfe9f96b701c23d9a325/dujepefigesasa.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/88797958834.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/setikemikasinixit.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cbbsahfmej4dvgulrop72qbt83/32343814953.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/45529375334.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/lijowavikipuvinanumibin.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/sugetosew.pdfIn PDF document text
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/40880825b4b3a17316c980923b6b8130/papaxuko.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/wasapozodimukovevak.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kemowi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/kiluvanetawasominu.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/faral.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=radar+systems+analysis+and+design+using+matlab+third+edition+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e07b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07B 11344 bytes
SHA-256: c0b8aff21e8c050bcacd49e2236a03a4840021247ce729ee30a8af026bf692ca
font_02_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 19288 bytes
SHA-256: ee51a14624eedb2883127317263b4d03b4e4217f7e7e3a2c16ddb3c028ee1b4f

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