Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f04175e671debcc…

MALICIOUS

PDF

71.5 KB Created: 2021-09-24 21:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8d038c83a456451e6eca30ab9ec2fc0c SHA-1: 6c05fd116a8d7bb8826f024b568580244433b852 SHA-256: 8f04175e671debcc3236170dba0607f2eab184f8e2013dd14263e56410e5c0da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with multiple URLs pointing to potentially compromised websites or disposable hosting, indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://dolmalatrek.com/userfiles/file/turiboni.pdf In PDF document text
    • http://tiquital.com/documentos/file/bekozazu.pdfIn PDF document text
    • https://otomatcilarmetal.com/otomat/upload/files/52890722789.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/safiseweneteletapano.pdfIn PDF document text
    • http://vuason.vn/upload/files/tiruzonexikepiwiji.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5a5c4f13---vosibovamobomatowugobopif.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/vinilutuwukasiw.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/19827692618.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/83988927257.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/84883609553.pdfIn PDF document text
    • http://speckrepej.com/upload/file/76495977948.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161349d29bb3b4---42075703505.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/14641956799.pdfIn PDF document text
    • https://superchills.com/userfiles/file/62667661162.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/9250397201.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614b0abb97977---xotigawibulal.pdfIn PDF document text
    • http://craftland.de/res/wysiwyg/file/zasabuxijemamefogada.pdfIn PDF document text
    • https://adikkedua.com/contents/files/5270745629.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/musifibutikuwiwasovopara.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/xatalen.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb4cd6b1a---bitirizopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=health+words+that+start+with+kPDF 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_off0000b225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB225 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3C 10408 bytes
SHA-256: 575e2baf96a0a49cefe836e6659d6f19e4cd1308be61d80f9bfe0dbb4e1cd67a
font_02_sfnt_off0000e1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F0 17908 bytes
SHA-256: 250fc8506b3f087564302f98e74dfd1c56077b38b543125cd25618ebedf55121