Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e5dc7aa3582da4…

MALICIOUS

PDF

89.4 KB Created: 2021-07-17 06:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5344f6e111d23f1db49de00cb7d0ffd SHA-1: cc7d6e9c4e567a2e6ce482d9339d0a3700322fa1 SHA-256: 70e5dc7aa3582da42918eed8f8e9032d91ba0068b3cb9ae3f50bd2259a174351
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lead users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.stsmcc.org/www/js/ckfinder/userfiles/files/21051882548.pdf In PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/40371607528.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbcbb465f6---gijerodadimafoso.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b3754115eaa3e78433c486d6a4990ee6/gupojabapezilonukir.pdfIn PDF document text
    • http://hotechike.com/files/files/sigalunusamarikujanaj.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/70h81vdeioe9vjo7ppff1e00v4/filinefagujin.pdfIn PDF document text
    • https://alibabaoman.com/basefile/alibabaomancom/files/jawadoz.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/57f882bf88de90bf62ffc618ed415f74/zimunanagopogefoga.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0e321979f09add8ea49f972e2f64bca7/97196661214.pdfIn PDF document text
    • https://telenovella-bg.com/files/29798052470.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160841acc71baf---jegin.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/niguselipakasala.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868038ad207---63754689032.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/74513692742.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab9347dc96---sevexonatetobozu.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/bidukubugapofejo.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/sonatuxixuluzoze.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/k9ptkagb5p6nljjljv5k6mt7ff/8237819439.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/4q46ttnmhplm8qc6v0feer92pl/devotedemexidif.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/q42ih0amp4hkpvk6d1nbfagr24/wexigalazi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/pv2g7mo09c144to9a2grbm6lgm/vizafajozefigafesidipapek.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/35401193508.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/wamarifepaxolevexonet.pdfIn PDF document text
    • http://berbun.com/user_img/file/xudugopeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=outlet+mall+meaningPDF 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_off0000fad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 10188 bytes
SHA-256: 9c70d3883c7da36252755b5bd9895df8c0487218b448e643aa76de235a50e77f
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 17912 bytes
SHA-256: e8d4efbb7342dae32e3fe78f2277cf38897d18bebc7e1cfcfedb38f7730ed5c5

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