Malicious PDF — malware analysis report

Static analysis result for SHA-256 e58b020de45e80b3…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 04:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 8485f486734b539f3ccb10e2cb313f59 SHA-1: e1253bae3cf74682032d7a2d18a465c56131f8ac SHA-256: e58b020de45e80b332e6249106158b45a044e2a6d963dea3431c7e202e736576
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories and disposable hosting. The heuristics indicate it's designed to host and distribute malicious PDFs, likely for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • 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.
  • 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://casabresciani.it/uploads/file/kanenuxodabefe.pdf In PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/zulawisiji.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607df874f2de2---12278920000.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/tabunuv.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/48327356513.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/977020371.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/mumubatarixegolunofesek.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f59919f990ddb8f434ced504be902f2e/mapofexatazonobolukumubow.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/n3qi4bgtj3ingq40chd6k3h78b/23771487659.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210714035340.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/jebekufogafodozulelaku.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b807b933e6f---31316772405.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071f702dcc36---32120928653.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/51783687082.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/42803477266.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756f36540c1---86754354330.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/denige.pdfIn PDF document text
    • http://redactron.com/userfiles/file/80667199534.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/931022605a39d993077e5ea82bee509e/lokamerebudidupidizure.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160965e6651629---kexaritabinupofezejedup.pdfIn PDF document text
    • http://webbuilders.com/files/file/doxokanewubafufofaw.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/34881991044.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/7jt3qpq4vknvljgdh5a9h9va92/20523658376.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/90869555721.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b2ffdcba75642f0e22d2d69c529f0e8e/77501325223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=finite+element+analysis+in+engineering+by+jalaluddin+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 18516 bytes
SHA-256: 85a2d4189bbe84cecb8879ff107c6ce3a65f0cc955bfdbf824ce639316d2aa84
font_02_sfnt_off00012360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12360 11184 bytes
SHA-256: e3f7d586467058983d11a8136d1eff4d082ad7aee68ab926e2e0f08b79d21eed