Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a86d8e354f098a7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 06:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2dd33759ba7a5bf5a35dd3aed9916af9 SHA-1: 07a88bb16654e4766313a399a74188b9d1114a2a SHA-256: 5a86d8e354f098a7b21c5a1abac725cc4f270ddc103834f1615d6c7cbad29ab5
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a link farm points towards a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and URL findings are highly suspicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://drafthe.ru/uplcv?utm_term=euclidean+geometry+questions+and+answers+pdf PDF link annotation
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f3fec8c28---8472021879.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/0t1nnjc7guuljs24is5qp6pt93/59119345159.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/93715766470.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ac79e4c2196e52ab0a6e41bb74d9d083/41305591877.pdfIn PDF document text
    • http://hghs61.com/clients/9/98/9814c5f28b4e93efd1f74733a9fd6b0f/File/valamoxinudu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9e03138cd---44872408605.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/16352006406.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/52553073012.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611e29cd9785c---18039641835.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/80210229968.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/gupikulunipili.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/50429418128.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/29639175270.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/wumomojasidariwudu.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/rmv2sn1rgc3p7hc81c8d9butn2/77354369345.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/83595782502.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/tajozosegewesanunumikasax.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8c7aad78---regegewibafexojanow.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2c218231---funir.pdfIn PDF document text
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/86519160556.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/59253744a0640788d869cfccb69503c9/fetukusin.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/21515212421.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114259379588---7331145437.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d02a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 11392 bytes
SHA-256: 7e024d4a1406f6ce7098ebb774edccd0c612a90d8fd4809d202410463e215836
font_01_sfnt_off0000ea92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 17412 bytes
SHA-256: ab52276af9f4712a5b3cef0c9872f2eb7df3f6e03ae605c9f4640b8457b37206

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