Malicious PDF — malware analysis report

Static analysis result for SHA-256 82679598404f1226…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 08:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b1d786838f73639cd0603b6790060819 SHA-1: 976ca71c9b2dfab3d285878f2c0c8b4489eaebb0 SHA-256: 82679598404f122674e8a30c167e8bc5b0716774ac014a06b55e14cc28af10d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://myxroad.net/upload/userfiles/file///84453019531.pdf In PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/sajusivirutunixibimawa.pdfIn PDF document text
    • https://masihpt1.com/contents/files/guxufonigefaxinu.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/kejiwazusijonazivuf.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/65919280205.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/sogemagemibezijimiw.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/finagizowijumir.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/69361326037.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/pawogajibaxazovirof.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/7756406211.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/48334081193.pdfPDF link annotation
    • https://perkunasstudio.com/uploads/files/202109011343525350.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/vivopisa.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/78951976200.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131f550926f1---kafanufifepowaxaf.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4c251de5---74074974487.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/35412811201.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/40544345888.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613006a389ff7---50453946567.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/sewokipuliboxuvuto.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/labazubawopi.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/qhgb4pidkljpllf8oki0mv4g26/39167056295.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/a79rma4p7i51oid26egovvngqf/wepikubudobunolavunavaz.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nuxotifuveluxoruzoposonan.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/gosisulorobegonatim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=helium+app+sync+and+backup+pcPDF 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_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 17436 bytes
SHA-256: d27c86bc3253e585847a3462efba17a3621660b10c3f2d61173aab79f98c0dad
font_01_sfnt_off00011662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E79 10792 bytes
SHA-256: bd0f13c0105ed76934e7bf8f54042ff56dc1a2c311c68e619ce602a279e90fd9

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