Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b755c5c8f0f132e…

MALICIOUS

PDF

83.0 KB Created: 2021-09-03 18:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd04a3652e5cfa0e53a37284763c0e51 SHA-1: f2af3d6f0588634106a3980ec3af64e74df1ad0e SHA-256: 4b755c5c8f0f132ebc76e4f9c140ee0dbe8619dc8181fe5fcf08dfe182703349
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://space1500.com/wp-content/plugins/super-forms/uploads/php/files/3f73df1f6f8d58a1e7c6acd3c3580d37/rokexunanemisoxepexururex.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112252cb66d4---18565669188.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84513884217.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/61j7tjl2frgotot8cflc1v55vj/18349141102.pdfIn PDF document text
    • https://granchefpremiumfood.it/file/4469959320.pdfIn PDF document text
    • http://darec.sk/files/files/vejil.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/jidojenezepulogiwaga.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/796289ba568d5aeebfaef99150ee94a7/40352095098.pdfIn PDF document text
    • http://acquadiqualita.it/ckfinder/userfiles/files/xovasova.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/38924959014.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/3e9f618311b91f7843f1747a92cdb058/kesegakugabipoxuwoxas.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/2faeca3b245c9575974c657f9b0a5c89/venapudoxukedugavawowapaz.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/61204881914.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/10878742850.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/59081444973.pdfIn PDF document text
    • https://datawire.gr/files/files/12781714908.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/61274030551.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077e719a25a2---lavezigatunar.pdfIn PDF document text
    • http://xn--krmer-dnnebacke-1kb72b.de/files/file/jakafejusawixex.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/31312082259.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/pixawesuwedalepij.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354fbcf1d---18925458925.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c46139e593---lotuwefatajijifusen.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/naxijolotemepexuvi.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099161021b7b---98836400212.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/xotax.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/difutet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=vocabulario+pronunciacion+ingles+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_off0000d633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 22412 bytes
SHA-256: 0cd496e3f3bc09e209cb45c9fc242e9162df0dfd37a900ac832353e7744ac596
font_02_sfnt_off00012594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12594 10908 bytes
SHA-256: 50e4482c6c1af81e282a97cdfe244041ecf77110035fb2f508da166518ff2937

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