Malicious PDF — malware analysis report

Static analysis result for SHA-256 131760e51f32df32…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 22:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 59d3e91077b800e1c026cd5c292b88c9 SHA-1: aa49a315f13ea7ffd2c993a55cc32534f327b030 SHA-256: 131760e51f32df321b12bc6d47d7965e23b702cf5a860ec323e8ae162d0b4dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The document body is unreadable, but the heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://avvocato-callegaro.it/public/file/wujekumu.pdf In PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/77653630296.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc247cee65---kawamupe.pdfIn PDF document text
    • http://ndt-ultratech.com/files/64368541129.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/nisije.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/36412204434.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/teduvutox.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/wikurimexasu.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/55822552576.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7304ad906---63280773098.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/gojewonapuvisuzawaxegapok.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210922154652.pdfIn PDF document text
    • http://laserinnsbruck.com/static/fawaxodarujiresitomodan.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/runewoxufolivunamis.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b81568c9a7---70367505867.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/21849160221.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/63089967032.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/safimuvumuzipasurazegufev.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/dozaseximewexirubipi.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/30162539905.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/vibagisasebojoluf.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/25661511876.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/689422999.pdfIn PDF document text
    • http://119pump.net/d/files/94580102848.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=finn+and+bones+hacked+unblockedPDF 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_off0000b29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29B 10580 bytes
SHA-256: 82c3d584888edd005a8be20a1f35179d3d69f7ba6ab945261bc815aed232fb99
font_01_sfnt_off0000ca8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8E 15956 bytes
SHA-256: f8ed3833fd57196f9022c1992bdd18f6bbc534746679d40945a684aea1b5f977
font_02_sfnt_off0000f29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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