Malicious PDF — malware analysis report

Static analysis result for SHA-256 8320e4f1c0a067b5…

MALICIOUS

PDF

72.0 KB Created: 2021-09-05 19:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ef85a2c7129efbf053c130f6426573c4 SHA-1: aefa94e632865faec10689bd002bc5dd7eeef5fa SHA-256: 8320e4f1c0a067b5c5b8c57d2fbbb3dc5a9e515a182829965dceb83498de271a
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6715

Heuristics 5

  • 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
  • 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://chupanhnoithat.vn/upload/files/jiwure.pdf In PDF document text
    • https://medbillings.us/lightspeedweb1/file/9052652816.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/edae003c8781f81669934025e4262cf1/bewitogoradavazowemepurar.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/punetebukokewobif.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/sesebijizagudemepuvuliva.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/gurejek.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/33753958472.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/17808246616.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2432c981d9---47698900701.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/18360591063.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/k03th7mdr14kbdad5keah4a646/77720848844.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57822109be---84057637226.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/ruxudeguzivovibasukudig.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/23707092732.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/81470279203.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cee48798f36---44246179133.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085602c126bb---50624303825.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/kajemi.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/60213954881.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/56851840323.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/56401569199.pdfIn PDF document text
    • http://trivio.it/userfiles/files/70176167090.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070a6dd42291---kalilitazare.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/19806371239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=business+statistics+questions+and+answers+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 17616 bytes
SHA-256: 177395ce55cf7fb4be9fca1cb67ed02e30edf820426470b180b8b7c443f65c47

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