Malicious PDF — malware analysis report

Static analysis result for SHA-256 aead9209ddfc0bc2…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 10:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d0bbfc9a3fedfd8c80cd0d69c3bde729 SHA-1: a3e7e1d17d2b3329653e76beb9d5234ef1762738 SHA-256: aead9209ddfc0bc2f2e2fec9adc435773bbf569e24f9964bdcbff929ac99f71b
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URIs, many of which point to compromised WordPress installations or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a raw IP address in one of the URIs further indicates a potentially malicious intent to host or distribute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://berbun.com/user_img/file/91688949479.pdf In PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/j00ca598egs5tar49ip3tlol22/tosutikawaneteresa.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcda347d5d---zanorasoja.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8e1d563521519012d86681411377fb03/9546444943.pdfIn PDF document text
    • http://huiking.cn/uploads/file/021405293026.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a03db108---posozu.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/0498afefc029bc9d8882c33d2a8442a4/16451429345.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/jagiratajasa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b454aebc---76673172454.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/29197504073.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/ea06b9eb184b13f45d5161125d002565/99864075416.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610c71ff5b20c---16477634454.pdfIn PDF document text
    • https://medarbindia.org/ckfinder/userfiles/files/nutexamanofom.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/deravuf.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/61689321176.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef58d3960b---31837572335.pdfPDF link annotation
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609582d68689a---laroxigutuwutelogolopuv.pdfIn PDF document text
    • https://ewt.cz/res/file/fepafero.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/medalopiteluzuwi.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/a360dd4f4fdfd5dddc049474ffc7506a/notesuxata.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/38a79215f8edd9e23b99feb9efe2124a/sujamesu.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/34736978091.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/116425888160a3071bc9320.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/55141212598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=djvu+to+pdf+converter+portablePDF 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_off0000c1cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CF 19492 bytes
SHA-256: 7c016bdc3bdff30bf5467bde155d384a8ff1dc0039724a1ad09650a888c7b0f3
font_01_sfnt_off0000f575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8C 10792 bytes
SHA-256: 6fba78bb13fff7523e40708b34fe4f80f43d7b17243d881ebe5146a56b8cb15f

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