Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea6437644391e04…

MALICIOUS

PDF

83.0 KB Created: 2021-09-10 21:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4450dd97e44c96e4a6e8bf3f43e56f10 SHA-1: a81081657799adc24a9faf116fecb7b117fa5802 SHA-256: aea6437644391e0465bd17b0252c97360478c59faa4c162ef623c5801bfc2864
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised or disposable hosting sites, a common tactic for phishing and malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. ClamAV detection and the ML classifier strongly suggest malicious intent, likely related to phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://phubozena.pl/userfiles/file/bubita.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8b4b44ee3---doborixafefasodozub.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/40913865181.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/wilurimoxesaxuba.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/fivexipopozidapiv.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/94762685056.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba4f70140e---motusudinugal.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/22048608333.pdfIn PDF document text
    • http://napiarsaigh.com/images/mewudu.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/vazutidovefade.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/24714619813.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301f3f74bfd---64874282760.pdfIn PDF document text
    • https://uudanbury.life/files/file/3629756722.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/93331010359.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/54107316080.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/64234685405.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/wuzaropevobalazokad.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/98042792391.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/73561706567.pdfIn PDF document text
    • http://krakowska98.com/zdjecia/fck/file/jorizuzosanak.pdfIn PDF document text
    • http://www.polni.si/Images/files/27216653562.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/25844609744.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/ruvip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+bluetooth+unlockPDF 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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 18324 bytes
SHA-256: efe75c77b2c1bf16fdef86c61964896aec1da943acbd04a781e8ac0977e34476
font_02_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10452 bytes
SHA-256: cdd0ea70c08ed96ce9eb084a9be31aefee4e711f6c5d6b3e678829344ce52fbf

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