Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfba3591d81a2e82…

MALICIOUS

PDF

78.0 KB Created: 2021-09-01 15:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d081ff3a0e20cc5add1864765e135a1c SHA-1: 0513c2d916f4fe8b426a648f4a7a6cf31ef6b974 SHA-256: cfba3591d81a2e82684ae5881e922735a6ef18d71aa92e33792a03761cfbb399
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. These links are likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c65578109d---zudaromozeti.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/40jsrg921eblea0d080g143gv4/27336056285.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/98571025529.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/bopuzida.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/n5tb76obbl25q25shmqn7dvfkk/girirakurewi.pdfIn PDF document text
    • https://kede.org/userfiles/file/23215863978.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/89040522888.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/pabezij.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/madorewuw.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f80bcc1454---kopiv.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ec3dc0d558692ad8499631889d1e57ea/fefapodil.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/sizipesulakibi.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/xamizogomalekikikovaxojuj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a00f2b587ba---zowuvafelixigazapu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/104712d44509aafcfdc1af6f98cc1eb5/76602618568.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/nuwezovot.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896854b26aa---namorugoligazozuji.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/34740590488.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/vinisinew.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160beedd317236---25914180255.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/70045714294.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6lgajuvla3uldjetvo6c0jlkvs/sawinorowepedavole.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///tejofuwivomejovajevejinex.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/xomikat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=history+taking+and+physical+examination+second+edition+pdfPDF 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_off0000c9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F5 17324 bytes
SHA-256: 3eb2d47d2b49b64ce8d2c98cb8224f7fe00b467f2e4bd219f462ef9c9085815c
font_02_sfnt_off00010f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0A 11368 bytes
SHA-256: 7ec0770d8bf63bc2a093f92b06251a19f59d12c7216d5990768955cb427e4676

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