Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d6c09cff8f3249…

MALICIOUS

PDF

80.2 KB Created: 2021-08-15 02:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 786194292cfd11019e7ac4eb250bcd3b SHA-1: 946798b6dffbaa8e11c4a748e13970342147e7a3 SHA-256: b1d6c09cff8f3249da696dba2ce22259bd727a3ddf56367acccf10f5a1b4f2d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb88006e35---43012647849.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6c4c637a---23499416993.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/4a4ac7a3492a04fb38729a4289d7ea1c/kakunit.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/5b17d844ed45790657876365464c49ab/74109681947.pdf
    • https://silky.ae/images/bulk_images/files/35130927188.pdf
    • https://lescourailleurs.com/upload/editor/file/82243188206.pdf
    • https://serwisnawigacji.pl/userfiles/file/87162966996.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf957f476---6825227088.pdf
    • http://bogaarchitetti.it/userfiles/files/29789764693.pdf
    • http://toyotaquangninh.org/data/dulieu/files/temobubowajikidibipik.pdf
    • https://vestol.bg/files/file/panerasukilobuwusevaj.pdf
    • http://softtox.com/new/userfiles/file/94076842514.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/6cc4a05311777e69ebea3d690b5f612a/gorope.pdf
    • http://www.alborada.es/ckfinder/userfiles/files/98454332040.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/lobezopewixufajejukof.pdf
    • http://airelimpio.mx/img/editor/file/tajonepodadexodif.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/cd544431569fd4acdfd1074c971804f1/mimefisavisekowoj.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/3174adb7f44f203a5fc30444f734e294/duduwisibavidaki.pdf
    • http://consol.hu/images/uploadedimages/file/wavexokabapipirimelusoj.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/esuvvpkgdbjufgimn2nhfbpffv/30516122337.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/hv4v0jsi0vcvfdfhge7sbldm7i/dewedejuvajakulabevaxel.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a606711bb---xemalewigiba.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/22875704271.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4435358aff---dapegujisebi.pdf
    • http://domholidays.com/userfiles/file/4145868807.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160921d6ec1111---pafinaworenavagobisar.pdf
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/butabijupukizipo.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2ba63d67040b4a40523b8a2a4b05ca56/72933366774.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=preposition+of+time+in+on+at+worksheet+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_off0000d633.bin
e003d06415edf67ddce943742ad02d659539a58da572efbaf08c4f066a3af028
pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 10896 bytes
font_01_sfnt_off0000ef4a.bin
5b7ae4dceee8fd064e92b3732da69f91949b25b86e0e88e05c4ef2b9942f1c03
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4A 16648 bytes
font_02_sfnt_off00011a3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3E 16792 bytes