Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c1152aad0fb82f6…

MALICIOUS

PDF

83.0 KB Created: 2021-08-15 14:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 2b345d248d7fcdbce0cdd475e597f148 SHA-1: ddc5f3025e1c0426718c98b6ad607e168e9972b6 SHA-256: 2c1152aad0fb82f605fa5a2f88fd09ae1ad28e1379a2db4c4bb56752cd587d7d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is unreadable, but the presence of numerous links to potentially untrusted domains suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160834ea7a93b1---nibomiz.pdf In PDF document text
    • http://rbtyutj01.com/userfiles/files/95865204258.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/wexikunamofo.pdfIn PDF document text
    • https://grup-rul.ro/printuri-fi/files/pedexegujekujexozavuwiwo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/tesesinefibuxujagekavog.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/davikukajuwakedukiguj.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/38088835379.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/91201523390.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/63719427259.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/xogunikoxajimidezep.pdfIn PDF document text
    • http://limuzine.md/userfiles/file/33135544793.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/71873303056.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/77351725549.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/38997204154.pdfIn PDF document text
    • https://chpcentre.com/files/file/marodovivovamigaxi.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b393171a5734e9723faa2da151d900a4/43074748878.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/68328261023.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h54ph168r1jvi7bd0t9i0edbkl/wisozidof.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/40262380679.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/25312322781.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/53316913411.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/tuxaponusenejarikifixadaf.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160846931d27a7---xumubukadatevavumetefuk.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607a771d83df4---ligalugapekapojulala.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/12796055586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ejercicios+de+crecimiento+poblacional+exponencial+resueltosPDF 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_off0000e181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE181 11132 bytes
SHA-256: 0068b5cfef7cea44638a02e6ff0a60d620a18a08f2fb7bb378f07a71794fb108
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 16676 bytes
SHA-256: 31f77ec68633f1c5336e0b0a3f7595983ad2c36ce2830fce4b5fb888e41151b8
font_02_sfnt_off000124f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1