Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b4a0be87919370…

MALICIOUS

PDF

71.1 KB Created: 2021-09-29 00:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e3a6474e597c685911e09d36f1001a65 SHA-1: 5762bc067777e14a6e328bed56d6f7377c1cb57e SHA-256: 35b4a0be8791937001fef89c32b73113b39a8fe8de9f9c12062b9407139e0bd8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://crysiq.ru/uplcv?utm_term=ultimate+football+mod+apk PDF link annotation
    • http://chokmanee.com/userfiles/file/33275286929.pdfIn PDF document text
    • http://test-immo.com/file/74597980347.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/33864245632.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210925_170519.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f87b7f0465---genenipoguxumadutonixok.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/tufijetiragodewaleveza.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/wolubivugemejapilo.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/241207171079.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16144486b2588f---rapobimanew.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613578cd8dc44---mafobonekewefogosebagit.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/lijowuwewi.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/7275860447.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/69161005618.pdfIn PDF document text
    • http://infinity-c-t.com/userfiles/file/guveduraxav.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/38629524463.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/fobekejiwe.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/68308840722.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/ep3jp55hgei91t9de27vhgsurn/18760834610.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/gilofotaluredufoj.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/tilekolakepezu.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/72664337539.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/91602591135.pdfIn PDF document text
    • https://jxlmedu.com/file/files/20210909_175731.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/vasibudusudo.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/39591777893.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/xamozaraxinavewigunuj.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_off0000b30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1D 17456 bytes
SHA-256: df126c5c7e6959d00b9617113d8cbb8ecffa0f1ef5461c0e9fa2b11298462dbf
font_02_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 10524 bytes
SHA-256: fb7238dcaf16d3966e2c946e21eead4359e78d2b51356edc0c7e9a9b20ca5f35

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