Malicious PDF — malware analysis report

Static analysis result for SHA-256 28811db7ba2c7d02…

MALICIOUS

PDF

85.5 KB Created: 2021-09-14 07:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e67f235cfa5e0442054e54d495704f1 SHA-1: c7acef56c7b43cf6e1d27062fc212aab5dd57154 SHA-256: 28811db7ba2c7d02a2b95858b08c2f31afd42776b607a6d7bbde7bcc08a50f45
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains, which is a common tactic for phishing and malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • 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 https://medvor.ru/uplcv?utm_term=friv+2017+bad+ice+cream+1 PDF link annotation
    • https://woodfur.in/userfiles/file/joduruwefedevubufar.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jtr49uvgkmt3eh4icl51edqev3/laxorifatumin.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/wudubunoxiduzamidipuga.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf757d6fd---301128798.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/91997430463.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/16500030340.pdfIn PDF document text
    • http://12shio5.com/contents/files/3204330397.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/jezesizorotapujubewu.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/buwomimagodutuwasebebiru.pdfIn PDF document text
    • http://keyday.ru/files/files/lejunevowujidivivumij.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/38764196527.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/wofamawexamapatafuxuwos.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/kalezos.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/bekibitajud.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/sexuwuj.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210904182543.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/93944891265.pdfIn PDF document text
    • http://architettomontanino.eu/userfiles/files/35246633172.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/53471918995.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/sagikoxizubusu.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/51757127926.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/27117576997.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/7c174ba5135eb117bced4f9e153fd6a8/muzejemi.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/kepojibuwakizi.pdfIn PDF document text
    • 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_off0000e9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10524 bytes
SHA-256: 68ed8983e05e6e453f20a7ba246605258911bd84bcc757a6e97acad7bbd0ad16
font_01_sfnt_off000101df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DF 18032 bytes
SHA-256: 7b9e53a1c00ba365c1c22de09fb80b28dd6ed2ec4ac24448ddf9f53521b6ab7b
font_02_sfnt_off00013087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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