Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86885f68fb27d34…

MALICIOUS

PDF

87.1 KB Created: 2021-09-21 14:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 52af032521fe440e243a95cd3a5b505e SHA-1: 9399d392eace00eba7e1a68ef6fc17a42f71687e SHA-256: f86885f68fb27d346da88d9addaaacfa328d66a8709188dc8e35362b5b8d0e0d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a high number of embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to exploit users via malicious web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=block+pop+up+on+chrome+android PDF link annotation
    • http://chinalabware.net/d/files/renudagin.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/rubotuvizuwobi.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/97190956831.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/fugobikijo.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/ziranufimeminafuzuji.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/defijul.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/29014699599.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/smgb1u9ehb0ugrjlbuhvp0vcbq/29132202939.pdfIn PDF document text
    • http://xn--b1akwe.xn--p1ai/userfiles/file/besokutoxonerubeva.pdfIn PDF document text
    • https://rumputhijau.com/contents/files/64757009148.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/44467361343.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/3iltp0ffe684t5vp4evqnmnfq2/tipetakevovo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/bivab.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/10898918534.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/xosegirexawekakubesowo.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/t39787mnv6r1bvgqe0grjdqpo0/42059236332.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/13547134571.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/vetolafurivuridavatelod.pdfIn PDF document text
    • http://sdes.in/uploads/44310949782.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/16297979988.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/gobivax.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/27229441304.pdfIn PDF document text
    • http://ephtour.com/FileData/ckfinder/files/20210902_B951F16D65737C82.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 18028 bytes
SHA-256: e11ed42b12cf85db099d1097673ff071a3db64002885f418d3fa292072365169
font_02_sfnt_off00013608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13608 10756 bytes
SHA-256: 015db88ab41d95d02fb032a61a20296854fa7d160866f51f387145fb25ea0004

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