Malicious PDF — malware analysis report

Static analysis result for SHA-256 10b1a80a324e9a18…

MALICIOUS

PDF

95.2 KB Created: 2021-09-04 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 49aa0551b453b52555610ce38254446e SHA-1: e209bcc91a9e11771782ed997e853633681a1c4b SHA-256: 10b1a80a324e9a18610d75e305a2a69145fdfeb170f72543a5d9508b74cf5db8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, likely to host further malicious content or phishing pages. The presence of numerous external URIs and links to compromised CMS uploads suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 6

  • 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.
  • 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://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/pv86r8tdoi559ta3l2o69t99fc/numudijiwe.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f6f01e296497422576391a2d0a110629/waxafonive.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff0a5c4e99---tajawepelebavox.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/danuxusekakor.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608e930e8f31d---33249286983.pdfIn PDF document text
    • http://allasclub.com/campannas/file/52552830603.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/981853d85640ce0569950dc19d06559c/gegegera.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/mosafesufi.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/lezixodogepa.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/lilutitetapoma.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/darevosugi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79f8c51b18---87006331690.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/472ec940ccd3bf05751b2174953145e1/xopixobupobumijesu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160832c157b3b4---13785374364.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607224d9ccbb8---57232448123.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/dasizuworokinemapebalo.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/mumenosufokopi.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/5333503226.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/xutomud.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e110a50e4---33725645535.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/fozafikumotajukedokodo.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/3063fa23edecb048673003663c53c223/86149996080.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96176ba5d4---wudemajo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tf4ckfsapktup76ke7rqcemn96/kobekuzujeluxotedaki.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/61288872760.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/xulakilimija.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=street+persuasion+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_off00011148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11148 17632 bytes
SHA-256: 670405f139a2d13c0cfced72d3813eef19c7763ba03d79c086f99d1abc88a4ed
font_01_sfnt_off00013f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F12 10620 bytes
SHA-256: 3f9d45c92589ec5bffc3ec04e73cb6bfe03056f56fc39735dae57c5e36364d42
font_02_sfnt_off0001576a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1576A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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