Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db6ab21f9332a49…

MALICIOUS

PDF

98.8 KB Created: 2021-09-06 00:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e480e4a6be6cb59950341fdd6d51cfc6 SHA-1: 8a09ead8cdb16785bb85a612bd4d6e273aa0e451 SHA-256: 1db6ab21f9332a49054a3226840e84498ab0de17ed5a34d484f84975fcece9ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some of which host PDF files. The presence of a 'download button' lure further supports a phishing or social engineering attack pattern. No scripts were extracted, but the overall structure and URL findings point to a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/np234ce57nr02f2r50i7tpj57q/leratiteranixupexi.pdf In PDF document text
    • https://elearning-chemistry.ro/userfiles/file/jalokalunij.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe187b62d1---nejagizobugofulorob.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/i507enqt8tee7tp30nmcb0k116/71463782275.pdfIn PDF document text
    • https://coluer.ir/documents/file/wukasogutawabokajeze.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161289ef5eafa6---77837182666.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/57772305996.pdfIn PDF document text
    • https://sca-kc.com/scauserfiles/files/32798714220.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/g31hhetia4ppofr4jh83luvu3l/lufibif.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/68429103710.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7f06bb7722741c643de5c09a7d093e24/monubogerosuwelutebimo.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/33445024204.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/retar.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/fivebopude.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/39711578897.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/7195971043.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16075489f0e211---zuvurarevumizomezi.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5a30b8fc1d03f4dd77059084c4f70eea/momofilane.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b34160b759---83686202613.pdfIn PDF document text
    • http://effektfilm.de/files/file/46479212777.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/semibave.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=printable+morse+code+chart+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_off00011c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6A 18612 bytes
SHA-256: 710ced4d5617861a39b162119df797234e413e63d3d122f41d36efbf47330537
font_01_sfnt_off00014c54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001646b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1646B 11024 bytes
SHA-256: be6803b85679df0ff59acd4d467b5dff4a8531fcfce08d6a374363bac2c3a478

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