Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e34d58d48e0bad…

MALICIOUS

PDF

227.6 KB Created: 2021-07-01 00:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 818e080d433984e8f6830493a8fa8d4f SHA-1: ecc1b4faac1160283cbc2c055f2fd8e2c68bff53 SHA-256: 90e34d58d48e0badc44243b48b23c6ac4c98081e410d2bd1f9db58a448cf50d0
134 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm pointing to compromised WordPress uploads and a high ML classifier score. The presence of a 'download button' lure further supports a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable, but the associated URLs and heuristic firings strongly suggest a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9819

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=driven+book+series+free+download
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e4b87e4dc---8590871339.pdf
    • http://harryreichert.de/uploaded_pics/News/file/lerowomifisukeruzom.pdf
    • http://beijinghuojia.cn/userfiles/file/63475303856.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abc53d0d0b3---71111898433.pdf
    • http://seoulsquare.com/userfiles/file/96474325501.pdf
    • https://suprizpin.com/calisma2/files/uploads/29672443846.pdf
    • http://ezibra.pl/upload//file/xugevonasodesipifij.pdf
    • https://floridainvestment.cz/files/file/91441478169.pdf
    • http://driver-jazda.pl/upload/file/widumonateso.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160902478a8efe---48597899645.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/pudekizilafemamo.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073868f13bf3---90590378221.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9eed9c338---kinogoweg.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/1brh292ko4acr6likcv71asuf1/19431520571.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ogak05n23uvrg8nrdf8089cvl6/12091907280.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d67f8f06645---vasezigowixizuno.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1uul1i7gfrsgoj47lh6i11cnio/93014132022.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39c21baf9e---guwifimunepez.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/1a96e004b01ade9bcdca33c42af4b3b2/4379170237.pdf
    • https://sgcaregiver.org/contents/files/vibitarupedixojilamuteba.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44991eb5c4---guzadoxabajatararisamew.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-6-23/20210623103827245808.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160853378122d3---92454204410.pdf
    • https://cakenflowersonline.com/userfiles/file/19364373230.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00032027.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x32027 16792 bytes
font_01_sfnt_off00033839.bin
b4e4946ef30b9204427c70a7c4e1095c1eaabeebce39fd376a41369878842d77
pdf-font-stream PDF embedded font (sfnt) at offset 0x33839 17656 bytes
font_02_sfnt_off0003665d.bin
3c06abb8b78a126928ed54c32960fb5475658624df19fa39d05ec47d89945ee5
pdf-font-stream PDF embedded font (sfnt) at offset 0x3665D 10632 bytes