Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0d2472bb9ae713…

MALICIOUS

PDF

90.1 KB Created: 2021-09-06 15:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f040039bb0874a01b98c2e60b4826ac6 SHA-1: 1e38b2768d13d0aef943e301cd5e62254e2f2b4e SHA-256: eb0d2472bb9ae713c8ae82cf8ef93b09d6c145bcea6a7e352e035d73beb5f535
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to other PDF files hosted on compromised websites. This pattern suggests an attempt to manipulate search engine results or lure users to malicious content, aligning with phishing or SEO poisoning tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a3a4dd076228c2e57985fa60852f82bb/jizosa.pdf In PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3654f5fa8a---50688804583.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/bunefivivigiru.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4958344e03---sojitokebudivoketufafoxi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16100380ba8756---xakuwofagon.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/9366837474.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/c22c5442528b5ad92f3c9b2f287d9677/26684419874.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/muverozanojefojisob.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/zilipelas.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/gibuzaxigo.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/tenosuwudazowi.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/tijesupiwit.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/f9rr5v2ic1uqcar04447lupjiu/79481406241.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/91314218076.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/m0sf2rm63ikodv9i93qnr5ah50/27745571137.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021061018161873499.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/3c7c209fa59d206cd28d47360fc13d93/nemez.pdfIn PDF document text
    • https://blogsma.com/files/natizisididejugelabini.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/94198139584.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab487ec7113---videxufeputubugovikip.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6e9a4ee5---10199581010.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/jegezogijokidofirupu.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/bupizepiwekosafarixeza.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/vedategedowojugozori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=science+fiction+books+download+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elemeIn 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_off0000ffd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E5 18428 bytes
SHA-256: 29d9c298099c808319cca3e96a12c33a48debb69690e299c0b28c45a056d3518
font_02_sfnt_off00014795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14795 10908 bytes
SHA-256: 37e2450f5cab989a06b0a54fef20da039c8158b670cbdbb3f04ed18b52918a9b

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