Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9806bf79e0ca778…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 01:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c6cdbc96237125351ac36bb9f01ae905 SHA-1: a4369eb1c7a05f97e7141af15585de50ad0072e0 SHA-256: d9806bf79e0ca7786d7ae677617b86ca3ddef7343c23573f869ceb73e9dbba5c
176 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The document body is unreadable binary data, suggesting it is not intended for direct user consumption but rather to exploit PDF vulnerabilities or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://canadanur.com/resimler/files/83458040741.pdf In PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/82212921415.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/legewup.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/vutuzad.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/monikivifusikutizol.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210918070726_1681005519.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/baxetirujex.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/8694824859.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/tiwezesinoza.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/libunonetuxaverijug.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210911185513.pdfIn PDF document text
    • http://ge-mak.com/files/notivinelisuxifutuluno.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/46057902681.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/bizoribabiwiwotebut.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/767652915f59151018fdf4ad0c6be63a/goreradubenijovufotejuga.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/99968677732.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2aa87e50a8becb249f2ba497e50c49d6/71725536772.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/rekojepukemonoredip.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/56360354006.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/1657095202.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4ed2b6bd1---52688312101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+file+transfer+no+android+device+found+macPDF 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_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 17284 bytes
SHA-256: fd81175b030338b63f3bb4689bd5b1b130e6afe52c08d403d1c2b7c4813b8eea
font_01_sfnt_off0000f800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11017 10784 bytes
SHA-256: c2c75595886c9b83f018f6b14bf3ed70614104e1125c0f34e6f874e6406bccba

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