Malicious PDF — malware analysis report

Static analysis result for SHA-256 53f4eafffdad03f1…

MALICIOUS

PDF

80.8 KB Created: 2021-09-07 09:46:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1daae4b0751619e17eeecae4644cea75 SHA-1: 24ffd1cd9b599e88ebf4a7e0fb5d9ed997e24eff SHA-256: 53f4eafffdad03f117e17e48bb58babbed3b406f027feeb2c3e024d0addd9521
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites, likely intended to redirect users to malicious content or phishing pages. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it leverages embedded links for its attack.

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://intproplaw.com/admin/uploads/file/99471841055.pdf In PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161013461cb7fa---69354415632.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078685d4277c---51488260643.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ekkqito8qt6ffoggqde3s525p/67311315862.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/49762789.pdfIn PDF document text
    • https://chornakorn-packing.com/ckfinder/userfiles/files/48714280916.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edef9643052---60213986623.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ivt6jt33h1f08pu0jcmn221hna/38073828636.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/12090037072.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608686fc3bb53---94405390714.pdfIn PDF document text
    • http://angelofthewinds.org/ckfinder/userfiles/files/fizumirotupin.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ff74a1b9---37795635269.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/cnculpa1vdqst2sb945mk7dm15/bazemegijuxajarawe.pdfIn PDF document text
    • http://orem.mn/uploads/files/bapuf.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/9374a1aa4a64c61a347af59e3d2c56fa/48154607970.pdfIn PDF document text
    • https://ovalpolycoats.com/media/49346487391.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/xerumuzeduna.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/zaxiwepipigojinof.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qis784bmhdb9ff0f9kqgsdjte1/73040478620.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/b0440ea84fb631070b3a32af74689f39/67110240986.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/pamezutibiwabonun.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/b9afa31970ceadb1a4f1e0f454273852/diwifuxafonilufuw.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/sakejes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=igcse+physics+measurement+and+units+worksheetsPDF 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_off0000d3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBE 11256 bytes
SHA-256: d7b850eb7f58a4158563b0385fa487b2b506295dd85dcc91964055111a8d01c0
font_02_sfnt_off000105dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DC 18356 bytes
SHA-256: 6202ca4a5ba33345e5ff9cfa41b9e5f1083459095d6142afc2dea2622072db4c

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