Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63e7d54ace15c7c…

MALICIOUS

PDF

125.5 KB Created: 2021-07-08 08:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0c456659012c700c2d3aecef8e85d4ca SHA-1: af852a6b08831a96edb0b645c99bfc45b0861c57 SHA-256: f63e7d54ace15c7c8f7d3485e17467b4836459e453c023bc967c544c9770f09a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve to distribute further malicious content or redirect users to phishing sites, making it a potential spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5abda724---suletida.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609262f2d8f76---sejaneku.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161182334.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/20487516263.pdfIn PDF document text
    • https://veterinarycarefoundation.org/userfiles/file/23675786247.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/2285732636.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609d894bb61a5---17162806013.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/fc8e0b9758654ed257661847f3f089e2/waketigoditaxepom.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094547ed08bc---wujukasudupawiwetuvagu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd6535160---fajovusiratuneteneweni.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf4f4d8d6---kivolegagebanepipuviw.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/b622cf49eb6071d08521873a5d197837/danadux.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d6a57f5d1---17916358072.pdfIn PDF document text
    • http://mega.kz/media/upload/files/gefutitod.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/jokanolajonutipuwuxanogar.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/turulupoponikewa.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/6077938231.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/8cf07063d5ba1927826a5a167a093393/rozozotijaluzamuvisida.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/varuligeme.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823097ecc9f.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=causes+and+effects+of+the+market+revolutionPDF 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_off00018620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18620 18240 bytes
SHA-256: 6a5077545aaae928923bc83aaa8aa465aad5889123ee06f66f4c5463c906487a
font_01_sfnt_off0001b5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cdd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDD7 11032 bytes
SHA-256: 97471aed3a32c89cecfc70e89671d27d3f4c217a3506059cac7017b38cbfd963

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