Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6cb5545b7659801…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 08:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb408c048984e03fa984e21bab4d7dda SHA-1: 9d1cfe517abcaa452681cf2ddfbd10420418d7ee SHA-256: f6cb5545b76598018b617df1ee756c2c4708923a57a08f2563262c4ad8b47cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://synerhu.ru/uplcv?utm_term=malayalam+love+quotes PDF link annotation
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/vefiforapaf.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/15202949498.pdfIn PDF document text
    • http://kmbb.at/userfiles/file/zomugesivukapolelafixi.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/dewewax.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/eavfotic1hsitf98cu66mjnsd2/1754066579.pdfIn PDF document text
    • https://mangmalungtea.com/userfiles/file/44029010612.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/a29deafded35f33c4e66580ca87914dc/tomogotiw.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/63s9gvpinh2f3lq5kcnr4hd3b0/3473820983.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b50eb085---84449144952.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/e6rgo4bnap3h81hb6hef91ffr3/31586644748.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/nisozuxowufuganu.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/fofenurowa.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/pebaboleso.pdfIn PDF document text
    • http://strandedtattoo.net/file/35275077390.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210706013121.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/zetobowirijuke.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/21642616430429da8ec4044724468555/fomuzigubagegu.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f368530c9d4---92477099960.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/gagitememoporugugut.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e8b97ac9---pewerukigazo.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/tipuf.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a61e614cf---26804390693.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a363eecd3e3---tapawesafezowujimoz.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/budazevoliwipupevikazake.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/eda903922bad95e3d51e1be3739ae088/95332416500.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/62262104629.pdfIn PDF document text
    • https://actorconseil.com/files/file/guramasemavavopidazefuv.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE3 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000d572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 10392 bytes
SHA-256: 89cb8ea3ff0c4c012becb572b3a2ee041c9d8bb44fbdb4ab8f7f9f96e3f2abd5
font_03_sfnt_off00010531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10531 19616 bytes
SHA-256: f1929d170df5b9ed612e0a1d3ee7818e29521988f62b805f9b96e0099a1a0ec3