Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a0cab709a0f0b2…

MALICIOUS

PDF

93.9 KB Created: 2021-07-17 01:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fdc2f61ecfb47cfe91036978fc43863f SHA-1: ca2c199f97c5630e5a9fd134c8aaa1085feb7bd0 SHA-256: 22a0cab709a0f0b2cc4c25afdd6864f6a1262dce4f8ae2297e12c6bbd9eaa3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, identified by the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d15d4745f---26797990032.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f59b0cfcd29af5c88182510cf1146510/28453648287.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/o66tbgl44e72h25f7crhmo9s11/moladezebemujifafavab.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/790037b47c2de4226e82f09ce4012998/60957746485.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/58563467963.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/73889240120.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/vf43q569762v3p6vdn27rf8na4/ripanujigaxu.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/21192302694.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160726e8643d3d---46948029566.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/50818471959.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c19590c4142ac79465701e2424d79b45/23487387455.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/42938318510.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3a76d475817c46f75d5e8aeb01f8d0a5/13125524979.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9289c98927---63965926367.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e5c13bec7d0008c78efab9c432dad177/46673345220.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/3773ebde22e63ada251ae8913a0e9c70/76863632762.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c664d5b018---89080609833.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c14f3867d43---jozujivasidufije.pdfIn PDF document text
    • http://masseydogs.com/clients/f/fc/fc2e217ffa4851e49ca3cd921a15cf41/File/vogudeka.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a98516f2ec235c928fbb627b58ef67af/ruxetizazodovuxonanaki.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/54235199207.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/51172431118.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4550153c5---vavagibopelonekexukazaz.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9e85f6321bf9b113298d89f319eb740d/wusaxesasejuvuvinevejinuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=comparing+two+sample+meansPDF 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_off00010989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001219b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 18348 bytes
SHA-256: f1d4755e5fcff6b06757717d325e5c80be55da6c4e64a8b53c6136af8b526724
font_02_sfnt_off000151ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151EA 10712 bytes
SHA-256: 604e5d4fcb497ac722c1fb43cef2b2a5a0b8d14bb8d7b4403fea1ed113b53ce1

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