Malicious PDF — malware analysis report

Static analysis result for SHA-256 a187f02548bef4f4…

MALICIOUS

PDF

89.2 KB Created: 2021-09-02 23:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fd6ccbc5161eae6570829c25a9f3c284 SHA-1: c16eb1bfefa91e60b4ea169a3d12de40b2aafb8f SHA-256: a187f02548bef4f43d2e80a0048bd2e192ea81b38f92a757a26d29b937e9df0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external URIs, several of which point to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the true destination. An embedded JavaScript stream was also detected, which could be used to further obfuscate malicious activity or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dianacb.cz/userfiles/file/xogekoz.pdf In PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/61396172764.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210726_E31DCEF95F169CEC.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/rilagomuwuxada.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/93440624238.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///losadotejusalulun.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d302307c7a---fivuwep.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/i2m3goo3jncg8rss6a2ddnrdaa/1377513468.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/bisuzijesinex.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/xovobifini.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/1b625236a12b0c678148fff78bdb9401/60148894120.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf93ea4954---wudekanine.pdfIn PDF document text
    • https://wsbtitan.com/images/file/kowatu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161131eac0e843---24636260237.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/bumorobojidujada.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/pewofogegarukanoxafop.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/93571046927.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/didovalukefesejobarogi.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16080a56b61181---tametegilidobuveneliviwi.pdfIn PDF document text
    • https://ismart99.net/upload/files/4807462207.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f9c55225---40910616339.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/33163642419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=phytochemical+screening+definition+pdfPDF 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_off0000f417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF417 11184 bytes
SHA-256: 93740344eea30d5daddb2af6e26d5ae66005191441c06ac748d481249c168be1
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 18888 bytes
SHA-256: 8c6ff483aad72a9156337008e687acc35a6483790e0f75d0174e7badc6d2c289
font_02_sfnt_off00013f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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