Malicious PDF — malware analysis report

Static analysis result for SHA-256 487db430577a2137…

MALICIOUS

PDF

84.9 KB Created: 2021-09-13 22:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc69c1680d4770e8be82ca0ac9c12f52 SHA-1: 90332688532f16d1f1ee888db3be3e68ac314f32 SHA-256: 487db430577a2137308db895ab93a5d2564655c494e0a6a0781e223a5fecf109
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=blossom+blast+saga+app+download
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/23171927983.pdf
    • http://bernendorf.ru/userfiles/file/duwatelutus.pdf
    • http://beauty214.com/uploads/files/202109060924139144.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd14c0dbf6---99078882684.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3fe1eafe---kemalapuromizazenowoxe.pdf
    • http://fskyok.com/uploadfile/files/xonosanuvov.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/95602720765.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/37635039168.pdf
    • https://elearning-chemistry.ro/userfiles/file/86523986548.pdf
    • https://hotelindigha.com/FCKeditor/file/54890242456.pdf
    • https://ruiguoex.com/upfile/files/2021/09/03/81094409677.pdf
    • http://dezis.ru/uploads/files/64565159030.pdf
    • http://recviem.ru/img/upload/51361193043.pdf
    • https://swiz.eu/files/editor/futadawudonafidud.pdf
    • https://olboihorgaszto.hu/editor_up2/71363271955.pdf
    • https://kujainspectors.com/candyticket/uploads/page_images/files/kejidunuduzepofokas.pdf
    • http://areaengineeringsrl.eu/userfiles/files/42337591630.pdf
    • https://autonoleggioassereto.com/file/35831683344.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/uproesk0qfrm2bmkhq8rqk3cr1/jomituzewa.pdf
    • http://gardenofsound.com/userfiles/files/78185780032.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/bmf5hv27pbfmqveia34fbj43gv/58424781141.pdf
    • http://hanasushichoice.com/uploads/files/sobolelobalurimojobexijix.pdf
    • http://metallpress.info/files/gapenimibuludusevam.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/31fe515008432ed73f413b8b00cf05fe/tupigusaloniwunosa.pdf
    • http://hc6999.com/userfiles/files/pevututofojupo.pdf
    • 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_off0000e397.bin
2499209e420b825e38a1ff6c75b3ca2d7d58a7e92fadbb195db1dbe96aace22b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 19152 bytes
font_01_sfnt_off0001151c.bin
fb5c6083eb262d65928134dac4b4471d60950eaa1d3b3c5b2b607e77e64cfa0a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1151C 10688 bytes
font_02_sfnt_off00012d4f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4F 16792 bytes