Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14a6297dcdfa427…

MALICIOUS

PDF

95.1 KB Created: 2021-09-06 15:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23db68907005a8891ff141ebb3e73570 SHA-1: 889a8073ebd43b964bb2eb579fc2e6419dbf1635 SHA-256: c14a6297dcdfa427c7a2e30295e770a83777f8037502b6d5e715b077aff2528f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608a48108bf1b---najokevazosefeteke.pdf In PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/57526811088.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/eee4ad51eee854c29c6ab60d1cb88b1b/16877198060.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/72575592101.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/tewevep.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/161118542d25c7---kobesenasapisowimozijawo.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/0tscaae61rsub5fkegnsfkvb95/82638768663.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xivaloseriviw.pdfIn PDF document text
    • https://groupunsur4.com/contents//files/64139780746.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160fbadee1aff2---59952127751.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/76174058291.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/4216243042.pdfIn PDF document text
    • https://computerzone.pk/file/86450797916.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/xoruzeritonasifefe.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/81049768419.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612e947e7d89a---wiwobumijukatosirigigame.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/64470942162.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607183f2cd1f3---93966235683.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbda2157d05---lumevegediterunoremetuga.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/e63b146d01756112722051106071e257/xeberowinedusupage.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160770e9774e5d---56701491340.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074466f65ab8---45616575876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ionic+compounds+containing+transition+metals+nomenclature+worksheet+4PDF 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_off000109f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F6 18840 bytes
SHA-256: c978a3e5b6976c57b4b0931d22324ea95e3603faa56d7d2fccf06bdeb8846dfc
font_01_sfnt_off00013bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153DE 11268 bytes
SHA-256: fed12a751c779ecd6e8c7a8c2ab83fa0ca6291ac90467605b726381a5bd5d109

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