Malicious PDF — malware analysis report

Static analysis result for SHA-256 343a8d95c96ff339…

MALICIOUS

PDF

94.6 KB Created: 2021-08-07 01:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: e08cfa5091b31b132bd38b91921ddc50 SHA-1: 1d5aab30fd53d9671e43347eb3f1789458da931d SHA-256: 343a8d95c96ff339dd484fec818beae629af32b78df7f4edf1c761edf75591f2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These URLs are designed to lure users into clicking them, likely leading to further malicious content or downloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=mapa+planisferio+con+division+politica+y+nombres+a+color PDF link annotation
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbac986a3a---11884192998.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/mozok.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdf98971b1---58970189859.pdfIn PDF document text
    • https://triosms.com/userfiles/file/xasadefu.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/stbjd3095tmmc85hjfb242ckj1/27008013154.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/g1tacic62c2uajec8g5r7oqje5/8936849277.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/30848251588.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/19136687241.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/jezexorafenudedo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090e3aca292f---90119773105.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/l0b0ji31ei26k7ophjtgh75fs2/bizifun.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/jojuzuzekega.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/popoko.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/kuwojotupubezexefubijite.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/37312907133.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/56548744678.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/afd408de006cf097156286b5663a9eea/13480508798.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/bh11j4v7hc6t7k6hr8nv4pqb3v/36248605732.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/19177037707.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/1f69458a3d4cc840965b904568fa7c91/70048796482.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/hjvm1he0e1i1hbbap91b2vrsne/61151923745.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210622181821_brjoos.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ec5fa764e0ec4603a99865e25917255a/mojelomis.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_off0001080c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080C 11096 bytes
SHA-256: 66567ed6fee8ef1fe8e6d69d2d80e32c3aae561d0fda2cf030a4708762268552
font_01_sfnt_off000121b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B4 18676 bytes
SHA-256: 61e6c37d1c9568c8abda8a562b3e995627d671f824a50e5efa5b09a8f7e4de27
font_02_sfnt_off0001516c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1