Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1eaf98c5193f8a6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-20 09:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8fe09091575c1c79ae076797fe3de01 SHA-1: 9a521b74b099fa1bee980ff0812241109df97435 SHA-256: e1eaf98c5193f8a63054469b5762fc0e1b7985051ad7f98945fabd7d8721d70d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal that the document functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting services, likely to deliver a phishing payload. The presence of numerous links to potentially compromised or disposable domains supports the attack pattern of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sakuragiramenandsushi.com/uploads/files/gonupurotuwipepadeza.pdf In PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/xabajalixew.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/99514977173.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/kovemozorariw.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/wupalepoxi.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161426327e10fb---jetanoxubekixa.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/25396308129.pdfIn PDF document text
    • http://becucci.it/userfiles/files/bivibirinanoxob.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/68763627961.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16146bbfa517cd---36239898568.pdfPDF link annotation
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/72565905906.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/50241416857.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/49804714034.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/52004347553.pdfIn PDF document text
    • http://internet-trade.cz/UserFiles/file/1738345369.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/9f1b97e625cebfd81f753db3ec7cb511/89117912865.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/pekagajimokuzemofi.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/jeget.pdfIn PDF document text
    • https://whitesal.com/data/images/file/5941_20210919221616.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemakijijosiraker.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/13614008623.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9f5e501795196bfdf3926c40f17243b1/67970586989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=where+can+i+rent+promising+young+womanPDF 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_off0000d44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44F 11068 bytes
SHA-256: 762da1f9e0e57535bd86f0c2076bb7486b200614b396aca458bba5986425721d
font_01_sfnt_off0000ee04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE04 19120 bytes
SHA-256: 454ea1eb861726a13cdf6f471349e44788b121cf58224d45d847646cdcdc1cfb
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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