Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7156379b8be7ca0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 07:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4a905239fb61cb2a6f69d220d263491a SHA-1: dd4a6bc70ed08c06935ac05ab4e1d463cc9a77c4 SHA-256: e7156379b8be7ca049d947d5b0a4e84f0f06ce3c3d4ed1a04d9a7dfe5342157f
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm, with one heuristic specifically identifying a link to a compromised WordPress upload storage. The ML classifier and ClamAV also identified the file as malicious, with ClamAV classifying it as Pdf.Phishing.Trojan. The presence of numerous URLs, many pointing to potentially disposable hosting or compromised sites, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alteanetworks.fr/img/file/73383907558.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/fb0c05fd5d69862ee87f20dff790f5bf/tivewekesixunasif.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/bavanufegus.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109081457555327.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/pefepup.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133618b09090---fajugojerokof.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ac16d70668c1db83c578de1d927c50f6/xeradulur.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/nituxagagikusexagipejiw.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/tefasimati.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/buzewe.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/girakorot.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/tosaguvogawilarij.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/26779712709.pdfIn PDF document text
    • https://begili.com/uploads/image/files/sitodozumewiri.pdfIn PDF document text
    • https://bachson.net/upload/file/rudepador.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/96006266363.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/pegimofo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614328cfe57bd---soxigodejasani.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/8233259321.pdfIn PDF document text
    • http://lehnerkom.de/images/uploaded/file/5936623003.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/90341814419.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/nidamumodakuso.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/wuwevutabamowokop.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/wuboxomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+upgrade+to+android+8PDF 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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 10740 bytes
SHA-256: f97f4cfceec1c18a41f201179886bddd903d278a0d6315a4fab4d70cf5e6fefe
font_02_sfnt_off0001092b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092B 17308 bytes
SHA-256: 250bddae38e4036f5965a10d3395fc6f7934a22ca1816df658166694f3e6227b

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