Malicious PDF — malware analysis report

Static analysis result for SHA-256 d279f0f526e4048a…

MALICIOUS

PDF

110.2 KB Created: 2021-06-28 04:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c38ea96faa4b50a4bb5d17ea440dfee6 SHA-1: 5d07d05d2da8261d20b74a63edc4cf72c8d5a46e SHA-256: d279f0f526e4048a6eb11debdb58aa14919a35b14e3f45e8a2d01b8d3c05a7bb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious sites. The document body was unreadable, but the presence of numerous unknown URLs, many hosted on compromised WordPress sites, strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8fcf6905f---pakozinuzi.pdf
    • http://steelbo.com/uploads/admins/u0/files/20210601045105.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/abd0f558ce2ec6a912d2752f4a8cccc6/dupega.pdf
    • http://alexlunacoach.com/img/editor/file/mobibomuzadidofarur.pdf
    • http://abwva.com/uploads/files/72221260202.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/1bf94e6a447e8cdb4d39aaa698d0fcb2/97987952562.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/khe5usei59pqrrmqjdr8gsc3n5/niposisipowog.pdf
    • http://botosani.ro/img/uploads/file/5514703820.pdf
    • https://baxsporthorses.com/userfiles/file/gitagodovujelafiboferobu.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9779f74ab2---29571698456.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f916c49c99---31648101526.pdf
    • http://kurier48.pl/files/userfiles/file/2501646585.pdf
    • https://lapalettedesarts.fr/gestion/file/64936827738.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cb0f38a3698---wuruduxesolifupu.pdf
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/9918301073.pdf
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/f6061535b86b994701b9b1e4df2cc3b1/gidozoxozunulinopubux.pdf
    • https://drsaman.com/files/36974181378.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a490fe2eed---18288652483.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/evaof7ngju4hf6l23014eorvd1/dugafigumileloxudego.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c345b473eee---lovarum.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39721332f---kovumuta.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608863ab3c791---80195916949.pdf
    • http://csc0532.com/userfiles/file/20210625201040_i6dlnd.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=co2+is+carbon+dioxide
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142f5.bin
6618d2c6b34158bc0ee37d6e17c28060f2711baf710eebf9ee396c9f57127b09
pdf-font-stream PDF embedded font (sfnt) at offset 0x142F5 21536 bytes
font_01_sfnt_off00017a0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17A0A 16792 bytes
font_02_sfnt_off00019221.bin
151a4268b8e75746dc9ad1ef5a406de494481c422db7f1cf0949996bcd6df4b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x19221 10612 bytes