Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c19556378eb3959…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 01:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2145f442f2d117dd324b95ba42dc9e4f SHA-1: d88dc93ec99389e30de18d27f2f935010c5148c0 SHA-256: 4c19556378eb39597fc8a017a79f7b5d128ae37c78b3187238e8f74c837e7ae7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The heuristic firings indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://utcsp.rustyramone.com/uploads/files/lasadurazinasodovakif.pdf In PDF document text
    • http://belovosushi.ru/files/kaxozaxasuxigesirutof.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/52297121756.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/72078553291.pdfIn PDF document text
    • http://dsraxys.com/uploads/81614116960.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b3f14e7aa---59694394557.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/28236109449.pdfIn PDF document text
    • https://elemental-ia.com/userfiles/file/jowesivovebejilijuj.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/fizovusobapujepofanoso.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/rabujusizajezom.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/69629923704.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b695bad7bf---28176486557.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/tetujoseseg.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/putuxab.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/642192661.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5667999099.pdfIn PDF document text
    • http://prestopc.it/upload/file/9176434508.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/537221625.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/xolonezotimode.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///jizijozujonux.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/konozarezukime.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/hjdpris98jt0sc1c5tc0ug7lin/62819875127.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/jatabes.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/46976589475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=minecraft+edition+mod+apkPDF 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_off0000df98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 10652 bytes
SHA-256: 3a0636aabf74d7de17cecbee2c088113333fdf33622ce2597a33a20fedd4c1de
font_02_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 18000 bytes
SHA-256: 7193da4cccf89427b8cf7be137999e8f4a67538f75b9df81195d7a7fac2ca6db

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