Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f670cc6f0fc319…

MALICIOUS

PDF

88.7 KB Created: 2021-07-03 09:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3c7bf9204c9f88fe9f1020883464d738 SHA-1: 8f3bf794af59d147de311bccb54787be9dcada1d SHA-256: f6f670cc6f0fc319fa1d5370b38a4964012b8e84adab6c826f0185c3f9940640
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and the presence of raw IP addresses in URIs suggests an attempt to bypass domain-based filtering. The primary goal appears to be directing users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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://dailymaytrogiang.com/userfiles/files/ripusaxobadadetefiwufumol.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608293af23da2---32584019359.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p3dmevq6uteponpjcbom8dqkn1/52207319973.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/18962321816.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55ee4a7c2---zatawibetexedobil.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021062020184649.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/goxuwutajemuvufixinuzogi.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9fa170f77---kabapavaded.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/l32q6g4f65bm8ugpbpi5u8kil1/2962733867.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609198b395d6c---26050507444.pdfPDF link annotation
    • http://aaronandanthony.com/userfiles/files/jurilolebukusobatu.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/gituvexivijefujevejikuna.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/viketove.pdfIn PDF document text
    • http://accronline.com/userfiles/file/nakokudasota.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5cef264acff69523c2c755eaad16d0d5/gobukefejax.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3e51f17e8---98616698514.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/mudozefusox.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/u84gh6bj182lnlk4v2217b15t1/11193792849.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be0ee51c07---59447872163.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/ginijugi.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/89153627956.pdfIn PDF document text
    • https://zegabilisim.com/calisma2/files/uploads/66823541423.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/ba9a05850ff40779de6185e8529e18fa/xodakupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=asking+for+recommendation+letterPDF 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_off0000fa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA61 16360 bytes
SHA-256: 4430a4d9e3752425019d7508cbe4adb9270b275b5b36d4b6cceed01f08f66f78
font_01_sfnt_off0001246e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246E 10892 bytes
SHA-256: 79b3784cd9ab0dbf6a14b9fc658c11e82852fa92df4ca6fae8c6a1ec3273b99b
font_02_sfnt_off00013d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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