Malicious PDF — malware analysis report

Static analysis result for SHA-256 27448414a5ae96b0…

MALICIOUS

PDF

75.4 KB Created: 2021-09-21 21:28:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2ee5910708a0bb18641430507a79f40e SHA-1: 9aa844c9f0f88af9598b67fbe5404be84201b524 SHA-256: 27448414a5ae96b08eb3a57740ef04e2f1ee8ccae9ae29361a6d93537803f30c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The 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 URLs pointing to external resources, some hosted on compromised CMS uploads or disposable domains. The presence of embedded JavaScript, though not directly analyzed for specific actions, suggests potential for further malicious activity such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://lammermoor.net/imagenes/file/beguzativufadot.pdf In PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/79453218337.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/86123261ab2979189f2874a42c281eb7/jojomu.pdfIn PDF document text
    • http://avalon-essenzen.at/userfiles/file/7354713396.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/xotozufa.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/49975159951.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/kizutubonu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/fukug.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109162338404873.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/25075185001.pdfIn PDF document text
    • https://digireg.com/upload/rerukodanexaloserigidego.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c26cfb6fb0---vumuwetikanasofat.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/25517614618.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/saxonekurixukividen.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/34668809224.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16133d21e72538---33010027607.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/jutemu.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/68691354566.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/kofutipok.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/wazosenirile.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/88249738437.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16142ce1fcde75---68568860563.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/74622422053.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/51038472262.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/bopunoz.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/vuwimujewatarulotem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=honors+chemistry+textbook+pdfPDF 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_off0000c27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27B 11116 bytes
SHA-256: 42ad3d090dcf60464bdb771716a697f7420be19a91f133fea23b834506cd6d87
font_01_sfnt_off0000dc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF414 16868 bytes
SHA-256: 5d4409b1b173d81d48de3ac84f7b0a71bbee5014585c381f972aec991cc25989

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