Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41af743c04f37aa…

MALICIOUS

PDF

82.2 KB Created: 2021-09-03 04:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 230272d9c54047b3a1a76b4d2e5940d3 SHA-1: ada6ba36c0c68af5eade168e32e34a0c1c1bef9e SHA-256: d41af743c04f37aa477fbf15975a862533dd251bf11dd66f92b6964812757716
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous external URIs, including one pointing to a raw IP address and others hosted on compromised CMS uploads and disposable hosting, suggest a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, but the presence of external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://keifo.ru/ckfinder/userfiles/files/15196204506.pdf In PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b76eef96705f239ca77d08ad1a76abbe/13515789590.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a1fb79ecefd412d2cc541ec6645274df/voxobolaja.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/sobumajujosunosutef.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a43bd0ce04c---xepufabejolaviso.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/69ae8ca0b38cb2b49ff2bf2d1e8e940e/judijezabufepugala.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/zepojemirulezi.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/61097509708.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/xobuzinagazovegopo.pdfPDF link annotation
    • https://jnvhardoi.org/ckfinder/userfiles/files/jexep.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aae1deaeae---27032451097.pdfIn PDF document text
    • https://poker-fire.de/file/38001417273.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/94e76a71f517fdf4d5a9f7a778956fbc/dideponizali.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/pakebo.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16087355e60256---risomepine.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/bawinavomuvikinilus.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/fubanonugonulop.pdfIn PDF document text
    • http://fultonhighschoolclassof1977.com/clients/a/ad/adf64365ba34d951c098eb677b062caf/File/wotonuresejarib.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/70803708647.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16098d61e42ed9---lemadolikonazasix.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/9fb2cc45c0ad5a265084ef4af8ad6d36/sokikonogafemukikumuko.pdfIn PDF document text
    • http://teresachild.com/upload/files/81364185825.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/5abc6ad332b74bd1f1522ade6d6a4f7a/gipurifixar.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607688744e006---dewumurup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=banking+and+finance+pdf+notesPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/0b8f56a8722d8ea3bed2d64fb26c8bae/53924708791.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 19488 bytes
SHA-256: b4d3b792dcc39cac3e3fa5c1259115decf5f1039ab1efaa3fea066d8afa3605f
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 10796 bytes
SHA-256: 025e0f0b395e2a0c6b9c55aa7ca98f8ca02cf2f32cabc841892671e8b0ec98ec
font_02_sfnt_off0001238c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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