Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b77dc696cd5915…

MALICIOUS

PDF

78.7 KB Created: 2021-10-05 13:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ff66a037ec766419808fdd6c40f916a SHA-1: d6bbe84e92bf08dc5cc0a8a5fa9ca332ed77e464 SHA-256: d1b77dc696cd591537ea999a5ad6174c3843c191653155f3e13cb745c7025ef6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

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 https://catamma.ru/uplcv?utm_term=india+political+map+pdf+printable PDF link annotation
    • https://techinnsrl.com/writable/public/userfiles/file/74065660715.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161539285cf891---puguwibujub.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/viwanukajawanewojajiwide.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20211005031928.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146a52815f39---nulokisewotorijofu.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/5860724058.pdfIn PDF document text
    • http://agenturamotivace.cz/uploadfiles/file/89313556144.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16329057542883.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/xibinoneje.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210907_9098A2DE2E0C7845.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/rikesadodeverakodetewe.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/48726768274.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/genunujarobelatufo.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/62547620484.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/xowozowulinepevejilowar.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/35135057353.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/8223741779.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210902_CAE53C001E2678BF.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/17287407179.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613246bb3b13b---83801033336.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/31443615869.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/dapukabupefalulupononi.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/nozal.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/69136542995.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_off0000c9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9FF 19700 bytes
SHA-256: 54f9fc61ea3fbe770fd56069a88fa17757e20013411cf3db69831130d4a6cc29
font_01_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 10704 bytes
SHA-256: 9b316d8766c886423b6b0b3f897f8b559a021e56ccb2188f05cfbb540f9b1da1
font_02_sfnt_off000114dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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