Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5c2950b9d32d27…

MALICIOUS

PDF

84.6 KB Created: 2021-07-03 00:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05a435496799f80a532cbf7f505e4d1b SHA-1: 97096622ac56a3a584d7b3e857c043759ff32299 SHA-256: db5c2950b9d32d27c2a5e1b07910c922eeac811d5c677caab80f4161ff7cbb99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous external URIs and links to compromised CMS uploads, suggesting it functions as a link farm to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://infrive.ru/uplcv?utm_term=minecraft+sonic+and+amy
    • https://impresa-valli.it/file/47975893904.pdf
    • https://vicotelecom.vn/static/source/images/file/93416938768.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2dccff9b6e022575a637a2f619869a39/tigexugurusozu.pdf
    • http://fly.no1-yes.com/userfiles/file/42549213129.pdf
    • http://krevue.cz/UserFiles/File/26344494956.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/cf4vstot9v9pi3ejbnmhn2u547/ribufu.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608038bfb053b---32803596666.pdf
    • http://archimax.ch/dynamic-images/cms/file/xevuxusexez.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba90313e64a---45353631327.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f228d9f433---63834139487.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/dcc4bc236908d7ad5164b2d3749c2b98/1877948831.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ece67a1d6---ragonozeruvaf.pdf
    • http://wowbond.com/upload/Fckeditor/file/70657486478.pdf
    • http://nitexprofi.cz/userfiles/file/1934992168.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c09bbc30cec---44684280218.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f93e76c832---73990446289.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/59108e6502dce2f6a396e17ba7cf374a/lokobesubomo.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/efpqdq1nl61mksknqhbfqbeqrd/25505699174.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16089ecf6ec24d---sedatelatisisep.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/68965678456.pdf
    • https://acrgroup.nl/userfiles/file/vabogulogopiwetibe.pdf
    • http://raffaelecavazzoni.com/userfiles/files/79757438919.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3a3a5fc3b---foxazulumijiluloj.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160827fa0b91a2---moloninujigenusebu.pdf
    • http://bukhatirhomes.com/userfiles/file/73379055840.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/34030767b4b9af6c756b31fb71f690b7/supaj.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160abe33be46ec---95759824877.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_off0000e65c.bin
8ebb083fc9ead254d439927d95524cfc0d1ea500de2018ed8ca10c2d1ed73aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE65C 17568 bytes
font_01_sfnt_off00011483.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 16792 bytes
font_02_sfnt_off00012c9a.bin
3f15e1c127f35ae5e06a0297ebe750a7b2dffd32ad596053bac02c6179560262		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9A 10700 bytes

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