Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa1e4bcd37e3f12…

MALICIOUS

PDF

78.5 KB Created: 2021-09-06 17:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec4e6fe9fcad7929d70b5082f675c201 SHA-1: f2e3a0afa059cb00c3e478b5e8d85e9634ae2eeb SHA-256: cfa1e4bcd37e3f1222c6052d08a81b85865619fd18f02979e3ab89b2dc521b14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://pixomot.ru/uplcv?utm_term=2014+toyota+sienna+service+manual+pdf PDF link annotation
    • http://say-international.eu/userfiles/file/zurolar.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/tizibogigijukojenefejij.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/66267222158.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/pizagobowolukodif.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/govokirisula.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210701152639_1105368536.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/89640500860.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/55461628387.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/utmk4u89mme4r8d966iuk7cb17/75356409880.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/fepugosabiwa.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/zujulixejakuzulejugi.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/36305f12616c46d787cbdd263b016f8c/rozonagola.pdfIn PDF document text
    • http://hasyo.net/files/file/9775253367.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7143d83783a699718ed4cf11e9308f0d/domevurojogarub.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/nutab.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdb53ea7d6---wuzavomusovofozizinobup.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/31580887156.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/18369307024.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fumojonanizowakimiwe.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/12109431659.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/92546683911.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/mifobozar.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/4064df69ab6b4338f0a462c9b85519a1/pibexadawamutemodok.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/31184939560.pdfIn PDF document text
    • https://cooperspick.com/files/vitegajixonikegajos.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_off0000cd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6E 16816 bytes
SHA-256: 77e8e15e9ab9a54a4b9ce90ca63fd92b19eded9b65ac25f2e93bbf53bd3b24cd
font_01_sfnt_off0000f946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF946 11336 bytes
SHA-256: 298846f3ab7e58e5b9181336455c420140500bc8627ec754a3decda5bea299e5
font_02_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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