Malicious PDF — malware analysis report

Static analysis result for SHA-256 66af02b5d9bd58cc…

MALICIOUS

PDF

96.8 KB Created: 2021-06-28 04:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6eb38a288524d785538395a6c9a736f SHA-1: 1a9cc6d1c96974c5f3ae7e137a92090a3d4920af SHA-256: 66af02b5d9bd58cc28c605d4892ff5fb5ff390bdabe07c970a496bb366ab96a6
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to multiple external URLs, some hosted on compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lead users to phishing or malware-hosting sites. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

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://backkwang.com/userData/board/file/62947614001.pdf
    • https://matrainagycsalados.hu/userfiles/file/42407245504.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6ad7a7b0b60138a97b6eaf1a10d45cc1/38503152108.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ccbf59ba894---39645135307.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/3ef38ffe2b9000b6c17244a90fce306c/jomivepuxigilufotome.pdf
    • https://universal4shipping.net/userfiles/file/jatusepetatedaxu.pdf
    • http://charivne.info/images/file/pefumogozadot.pdf
    • http://agrobud.net/uploaded/file/97017785331.pdf
    • https://systematix.pl/userfiles/file/dobugolofob.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070365527f5f---kevotunigivarelununezareg.pdf
    • http://reversetheclocknow.com/ckfinder/userfiles/files/24912230676.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbd9b386b8---zibodulojigo.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb60def1c9---ronaw.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb1cfa8263---xomelaxuxevawilaliv.pdf
    • http://ifa-astrologie.de/userfiles/file/93360890565.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16092f0b09d987---97571945911.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/12ca8dfcd2cd5810057029d088390f29/besiwaza.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7fb26011---23435015428.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7602e6a02---noriperebibilumutazo.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/057d4b3c7d54765ac29e3ac05710c59f/10397660247.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/5dd836c66907a757b1d368082357b59d/luxunulerodevuzeduriluno.pdf
    • https://arerp.kr/data/file///safobozolo.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078443b3f937---11353806981.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/e463bbd7cabd0a68d8b30c7fd1f5ffe2/kidogoguna.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/ab7a43760135599d592431746261736f/25196094273.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=gilt+edged+meaning
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daea.bin
1dc5d3b9fcef812bc00f0598b63c6cd92b790d33de483a42cdb1f09bd87596eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10244 bytes
font_01_sfnt_off0000f19f.bin
1baff71b485e3443aadda4a261925faf48c90cca3c19927216cb0802d33c0268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 3464 bytes
font_02_sfnt_off0000ff6c.bin
82197bdc8ac8def946f8efe37ef4e9db06f2e0978f9e140301c02b22691f3645		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6C 25740 bytes
font_03_sfnt_off00013f0c.bin
12c75175bf6cdca8d832a4c2b28273f4ebe747304e757579da0dfcd5efec940b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0C 17972 bytes
font_04_sfnt_off00015b5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B5C 16792 bytes

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