Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a824814920efeb…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 16:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f87afc4a8d18f1650503cbad2600f70 SHA-1: c7fbb43ca983bc327c104bd7b1d0567afc1a1ebc SHA-256: 17a824814920efebbbe5c7a6ed03e881181138d55526d3c7400a77b5bed3e851
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 potentially compromised WordPress sites and disposable hosting, likely to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to trick users into downloading additional malicious files, possibly through SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/omv5u19kqqlvsfnu4emsc0u881/57841032747.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/79187557100.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b813ca123c6---figalonokidetajukok.pdf
    • http://a-swiss.com/upload/userfiles/file/pozaxalemo.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4aa9f08fbb---76797405020.pdf
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/b45f98328902bbb6438fdc0c3d9a861a/46574456244.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcc03b86e8---kewevo.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbfca736d0b---2454864438.pdf
    • http://aleshashop.net/uploaded_files/userfiles/files/ganudipi.pdf
    • http://cokhixnktientien.com/Images_upload/files/bujatu.pdf
    • http://familiehollander.nl/images/uploadedimages/file/dakukovofepatafo.pdf
    • http://sanga.asia/userData/board/file/66475977448.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/87de34138958bd3ad51e4da3f62e1fc9/padaranim.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9r97icjrb8md9uv8aqb6007dtn/45126125973.pdf
    • http://ruoumoc.com/upload/files/nexogupumulobububebip.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/mokimodufoj.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb746392cb---37993114230.pdf
    • http://tfforming.ru/d/files/4475339390.pdf
    • http://boxethai38.com/upload/file/45613738008.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/357ecc9f5303d53b62ef8beb7936cba9/pepaxonibaped.pdf
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/9078907640.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=bhagya+suktam+sanskrit+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbe4.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE4 16232 bytes
font_01_sfnt_off0000d1bd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 16792 bytes
font_02_sfnt_off0000e9cf.bin
de04090ada3b0fe398e9c7f4e78f0d0a034d62fc472f81bc89c26583de6c75a2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 21876 bytes
font_03_sfnt_off0001222f.bin
458480b25eb2399fbbfd145e9b82b1e9d88a017c1b19174a53e75d02ede3faec
pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 11256 bytes