Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb250136c59b6a4f…

MALICIOUS

PDF

88.4 KB Created: 2021-09-07 13:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 23452a915d982f5b3a525dc649e64d46 SHA-1: 2bd55ae2b8297db8f8ccff09021bbcb8a1e1072e SHA-256: bb250136c59b6a4fb22bf5f5636097d0462e02e29f72a663bca6a7b0a66c1666
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to link farms hosted on potentially compromised or disposable domains. The presence of embedded JavaScript and a high ML classifier score, along with ClamAV detection as 'Pdf.Phishing.Trojan', strongly suggests a malicious intent to lure users to external sites. The primary attack pattern involves using a link farm to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://sevinctekstil.com/resimler/files/32924622261.pdf In PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/vuwosebelemugajeli.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/ruxadagasutelexavemudivid.pdfIn PDF document text
    • https://wita.lt/images/files/1192092725.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0cfbe58aa---23466501929.pdfIn PDF document text
    • http://dhf-china.com/d/files/sitigagojajejixudepab.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/punozi.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/jabizolitojodokatewuvili.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109012245556051.pdfIn PDF document text
    • http://samtekelektrik.com/files/2625368931.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/xujeridinowotixapikarugi.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/80521074306.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/68503321641.pdfIn PDF document text
    • http://stdtekstil.com/upload/ckfinder/files/diwavosatozadirerimuj.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/80813823123.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/lusube.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/fenipizajobene.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/regabedezufanutiliripev.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a0bdd6ae---8072183285.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/17100939723.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/tosofinevipadejazel.pdfIn PDF document text
    • https://architektor.ru/uploads/file/fureloxetuzaxuzokime.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/zigumejuw.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/5981662076.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e39f316371705b6e6c97a657b1c56c89/kiwubijagetovij.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/peloxejofedav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=knowledge+attitude+skills+habits+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_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F5 18824 bytes
SHA-256: 641af4236081bc1f8ae15ac8ea30e17a1342cf6051764c19907bc18399052145
font_02_sfnt_off00013a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A35 11088 bytes
SHA-256: 33de09d1f174655068b1d7d5ef2330945836f2423e283d920ae126e397943c3e