Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed936c84914dcf8…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 16:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 064b3345842a6db584ad54e1773ce38e SHA-1: 050bf1e59d74c93b6c9d40f7e27f193b0fb5c67e SHA-256: eed936c84914dcf87d4fb28f0921aef5d3f8d97d5fad71d0d5df7bc3f31c7698
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. Several URLs point to potentially compromised WordPress sites or disposable hosting, suggesting a distribution mechanism for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://abzesolar.com/uploads/files/11805987681.pdf In PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/mutelutenesatarudutulaz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5670a8bb7---kopuxibejoda.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/baxirexomukorofikejelu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160762fa43f983---81195593326.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/35934418140.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd571d3e6d---26509164001.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f2eda559d---pelopogekelafivuwobu.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf8317ec76---50468476353.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/86646401ee9ebbc82799d97a98a62b54/87588200068.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tixejuvozuzevupudu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/35264092658.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/dijozabafijajawapomojen.pdfIn PDF document text
    • http://residenzaeden-albisola.com/userfiles/files/muzijujum.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kfdqdqsl5ottotda7rrvummsh4/diwitina.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/kosisajipufajilesifo.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/figadopegiwil.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/xebogox.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/og05s8eb84ipih0n3tlnh0a22o/zikomiku.pdfIn PDF document text
    • https://bioesteticaonline.it/file/39988856284.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/16187174614.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/61753694981.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/92826590733.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/jogikitunawojuginujawuk.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/73301240400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=continue+php+manualPDF 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_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 18740 bytes
SHA-256: fed0b0bac1173a4d9671c3e0f7d59b77137a64a159f7e365f4a8cefa793bd3bf
font_02_sfnt_off00011386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11386 10380 bytes
SHA-256: 30b464b5dfe54749c3bb2a613bdee7703de3e22d7306008e2645ffc79b325d1e