Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f67f208b17264e…

MALICIOUS

PDF

81.1 KB Created: 2021-06-26 02:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1372958a71fe5703e603565ad9dbdfcd SHA-1: b854035a6413706394c371e868ebd6212ebb8ded SHA-256: a5f67f208b17264e2202cab94b07ac54a6550fc43fdb681bf1d63163f1f00e37
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e0db3cf4cacb57909a040a52ffebcac/buribek.pdf In PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd28a8674a1---13522876182.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c927df1be57---kubolopenevewuvozofe.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021616446283411.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160826296dd734---fawanafuvemeworesazagebik.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6b9c6119---jexozijowupivugimixiz.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/83304435470.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/xeniparijur.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/senibomuni.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8j71dluu2shnt5b56guuaf7f1/pokaviduxolik.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41a26f088c---xevesapimoni.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/gujivolisulasifalesutowab.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202167843573904.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff582af27---73278832248.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d26acdec---50502425055.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/e64d8a5e5a89ffb147ed01639382979b/37968220594.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021051720050888.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/k8cuj4ilgogi4mibojf9ecjouc/gugufalosidisofafevupopex.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8c2ad390---repuvutatetubi.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae919b94db---xesokojowani.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vujifakifokofexalomo.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/fc5622c285593edcbf36b8b3b0008958/xaboziwixemobevavaga.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/49609247986.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/n175ka3q4oocj4v9v4a3fce4h7/bewif.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/c7be51a98fb38f31e05014a4d5aaa7d2/repisogufetowex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=practice+worksheet+graphing+radical+functions+answer+keyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D4 11292 bytes
SHA-256: bbfa778fe05bf82022ded7737dfb6b7d5b708c793c0bbcea0bce692ddc84c6e2
font_02_sfnt_off00010430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10430 1660 bytes
SHA-256: 83d8b69042e51bc20ff8f2b5d6fa789650ded0a96709c4f9a3a2a9fd205348ae
font_03_sfnt_off00010c15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C15 16224 bytes
SHA-256: 01a4920e3bb581c8046896c2da47decde3230939eecf9d872e5ccb43bba45dfa