Malicious PDF — malware analysis report

Static analysis result for SHA-256 c647e5cc14072352…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 12:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7b70cd686e0416c05abf862099a6987c SHA-1: 7b7852396444c708981fb05130559118528215c2 SHA-256: c647e5cc14072352d28fdb96f77352a07839f14d2ed88c1e00ffc28b85321267
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to trick users into downloading further malicious content. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. The ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 9

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/qf1mpa257rpptnr3out1fvqdds/gibekukixesopavokigojikaz.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4488a1664e---6952435055.pdf
    • http://fotossc.pl/_files/file/91284373583.pdf
    • http://lubrifianti-auto.ro/files/file/54832936742.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4b3a823e0---65389369304.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608531757310d---51487360641.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d8630588---87270041121.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae911341df5---64132083991.pdf
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608667e91255a---dipeserapazawibagupan.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e1194e8fa---87450275031.pdf
    • https://sbufficio.it/file/97756974037.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/380699ffccca2563f525728b4cec25c3/gapulanojepapelovenelixo.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe4d58bcdf---jokejekasixanorugij.pdf
    • https://virker-ikke.dk/files/55615281774.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bfb32f09---34770716998.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/oeraglr6lk56v92i6khib9bll0/wosatovigeguxarokuzaza.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c77a978ec---77510734779.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df625433a---96062097742.pdf
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/62348195623.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ebbe5dc42---xiridiramovuvu.pdf
    • http://kaies.net/upfiles/2107081157115387724znfk3.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcb9d49f78---fujewazosufeterufuredi.pdf
    • http://ranjitabiswas.com/userfiles/files/85134556081.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c24ed09e75---garovijuregefelos.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb74f1192ab---63797703907.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/sf445r6p9qlgtsgsntdsenhpp0/jidek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=docx+file+not+opening
    • 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_off0000f121.bin
5011f09d350ae60e21363d82c9a242ea64af20a7a7b36198c3302ab9a2ba016f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF121 17812 bytes
font_01_sfnt_off00012044.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 16792 bytes
font_02_sfnt_off0001385b.bin
dfb3df82055b01ce70661451202f09e011c46a49cc8c87ab45b956ace8cedb98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1385B 10328 bytes

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