Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6de754691997709…

MALICIOUS

PDF

89.9 KB Created: 2021-07-18 17:55:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1fcc7636bf39f1ba598350917854be47 SHA-1: 45de528b1abc33342deb94d827d097053d704a7c SHA-256: f6de7546919977097493f4d7b3b9801d3de90a2d7c5e249f8f02e129d8751fb7
164 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, but the presence of numerous links to potentially malicious PDF files on compromised domains points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/84447590377c3c4c41ee728ea8aeed71/narebevoxodijelalerirazer.pdf In PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/pupidividalogosejagamu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rjrnqtrk4slv4a4cktd45s0dn6/zazotanidunepime.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/valexirog.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390d6c06cf---kirulovimagivim.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/qf742nibilnr6ihao5ek22n5d1/zijenufepixadukoxu.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/welesugaverujirazelizud.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/2235072629.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/67741422887.pdfIn PDF document text
    • http://parkettes.org/clients/b/b3/b30d687fb0e6fb0c44210170e51784d9/File/japexof.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b154bd6214e---rubodozakejuxufikemitutid.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/93033553207.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607355fc1c0b8---40341019239.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/d6c5532156bd5af561889db956bcb93a/5892091177.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/zatoxemuruke.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/7bd7044b4533535ec745268c4dac32f9/70532130787.pdfIn PDF document text
    • http://scro.ru/pic/file/26745244654.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2a3ecde4---35673411891.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e84f9205e29---85073652328.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/efc8bb8cd98ef6368b056d286df5de85/85752866952.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/rovutibeduvalotumileris.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/49q3bqvt563r4kkhnn0snncfjv/3456683711.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/tafadurinirinalisamonam.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/1c6f38a97a76de34011c7095c97d7d8b/xugizix.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609126f5d7986---jugigomuxalifesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=ctet+important+question+with+answerPDF 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_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 17284 bytes
SHA-256: 7e2b3f8dcacf11e1941fa40f5a2688273cf7d561dca4d426cdd33dee8b7ee00f
font_01_sfnt_off000127ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AD 10832 bytes
SHA-256: 9fc96131c296b8028d5e4be7c2325e4f1b99af4306c60a9ee6d75a51089a7645
font_02_sfnt_off00014087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1