Malicious PDF — malware analysis report

Static analysis result for SHA-256 b255f70ad4f20711…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 14:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aff0aeb38926831a94fa46c551dd92cd SHA-1: 38f87d7b0d4f467cd363cba4e4ec65b4ac03fbed SHA-256: b255f70ad4f2071195e9ea7419e5d14949a09f43183b3873e2d2e6fb1f632971
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous external URIs and link farm heuristics, indicating an attempt to redirect users to potentially harmful websites. The presence of compromised CMS upload links further suggests a malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=surfer+surfer+mod+apk PDF link annotation
    • http://www.haztartasigepszakuzlet.hu/pics/file/lilexa.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/36975489286.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/20912298637.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/70680256648.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416a2957170---81274748550.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/duzelaxowifakobakoxupok.pdfIn PDF document text
    • https://alkoplast.rs/files/doxasanomazimafesisiva.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/towupubomed.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/mawopedunixonarex.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/14rb7j8ecalbnqbm8fagub78e5/bodaranitojilozepev.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/28271323070.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48135714334.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/sekimubesawudi.pdfIn PDF document text
    • http://skupka54.ru/upload/m/59814712500.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/lupupamurotojugojagurinef.pdfIn PDF document text
    • http://krupongs.com/images/file/9861523185.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021091104485070554.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/47172472101.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/6d21257d32bb24bb133cad2952220278/lomaxajudevufewofopibasu.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/delukafitomerepajevowa.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/ditezem.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109052256558042.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/32465429566.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161430c625f61a---gugezovuraja.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/83705547016.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 16744 bytes
SHA-256: 862777c5a09e62aca0a0d90f0306a63f9a79336ba092548da76e59e19143849a
font_01_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 10588 bytes
SHA-256: ae818bc21e1afcd7b039060dd285cb9bb91df46d711eea7c16f5d90fb9754051

Open this report in the interactive analyzer, or submit your own file for analysis.