Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f841079dd36757…

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 00:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8acc92ba7028e0314e9315c6c5571fd5 SHA-1: cd5d2963ef046bff13f82203eb9813dab6040991 SHA-256: e0f841079dd36757f3293343261bd6d62a93d18a02e123f851c30352bc8126a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it as malicious. Numerous heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16091c793709b2---19646267248.pdf In PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/7099766775.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a19a5c0ca---27187038442.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b455ba33a8---darogi.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/79161541443.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/mdb2j7b9tiv689pbcnmfnc48j4/21957865883.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/k616a9h885o3iis84r7sk87u0b/lovuwimisuwinetin.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/05bf7fa7c087873f2dbf10041605f0e5/64886769573.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5fe782df---33996027809.pdfIn PDF document text
    • http://shopcloud.cloud//ckfinder/userfiles/files/rixaroxuzesoliwufanakak.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609485477f54a---mumegodaninenijojitub.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/visotavuzuwuder.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/puledetig.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768b081aa8c---fivenuduwowajukakika.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/zidisoxomugekikanuvovur.pdfIn PDF document text
    • http://slsnn.ru/content/file/mowujiragi.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9f8e286cd193550c3ce5e93b83dcf99b/karenimezewikuv.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085cefa9dcd3---zelolafivebeza.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/74969217086.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/mitebodedekigusu.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9madpjqceca59017076t8q5qd3/47743084099.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210628_155201.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/budumojafexolojetipad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=miracle+xiaomi+tool+crack+without+box+downloadPDF 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_off0000e8a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 17388 bytes
SHA-256: af8799cccac8eea6263f420944216685b9f261afcb7d9ddcdd665b7305da6127
font_01_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 10980 bytes
SHA-256: cc1ba07b9eecfc7dac63c79a9ae58d68e3939a77f5b545272c8cd04b6ecfdbb8
font_02_sfnt_off00012fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBA 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_03_sfnt_off00014539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14539 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1