Malicious PDF — malware analysis report

Static analysis result for SHA-256 4871583b7b5fd839…

MALICIOUS

PDF

71.9 KB Created: 2021-09-29 02:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e22cfa73e404e039da81d87a1e8a5f19 SHA-1: ed9ef2cef18e1f5e21b6a382f075b37e88d4372c SHA-256: 4871583b7b5fd83913653bccdc0a4254ce816f5f97a2bc610cfb074f936e66d4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://oniceh.ru/uplcv?utm_term=how+do+i+encrypt+my+phone PDF link annotation
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/tatesovorovogobasene.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/voforexifuwoponoxo.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cbf23cf1f---10228773577.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/jixoxizevavip.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1630916622327230437.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7b8231f9ecca1715684479f5821ae1d9/wikojixujefolurivazodon.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/fatuxiduri.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/gojanulefog.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/39940677484.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5c67141eedac9ca16ab200396e4f58ec/veromamojujababat.pdfIn PDF document text
    • http://gerocuki.hu/user/file/rufesuwufamolimawofog.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/51686571267.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210919151157_785287547.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/wadisasaseluzugojeto.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/feditugalumulujosumeduw.pdfIn PDF document text
    • http://amunt.madteam.net/ckfinder/userfiles/files/rujedilosubiwo.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/27528696185.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/67750271560.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613381eab5577---pajolesisomusurixuwakub.pdfIn PDF document text
    • https://zzhqhi.com/d/files/7391222357.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/bekusimizedup.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/83730128627.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA8 10596 bytes
SHA-256: a40f54eed83c9bebf629e8e554743ecc19c109fbace40f6bf99ed7f30c66aad2
font_02_sfnt_off0000e49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49B 17700 bytes
SHA-256: 5ac274dd2bde5ba358cd04106d35e23e9ba3d95a8a7d60395008af722f12dd9e

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