Malicious PDF — malware analysis report

Static analysis result for SHA-256 44838333b5dce23d…

MALICIOUS

PDF

93.2 KB Created: 2021-07-16 03:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a17f79c6efc8145d0e70deddf27b0ba7 SHA-1: 4fcf80b32cc994cdb330b225288ed732da3d1b25 SHA-256: 44838333b5dce23d0df6b8d3c440c79b764e7fb24368f20823326fd7fcb0908c
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload storage and other disposable hosting. The primary goal appears to be directing users to these external resources, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/1hlthdgm2ie5lqbk6psgoe3deh/29535110998.pdf In PDF document text
    • https://tort-art.ru/userfiles/file/57950341739.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/15472563069.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0d6e4de1a---67127665141.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fa3cef533---2600386745.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5687319811---sekurumexujed.pdfIn PDF document text
    • https://advik.net/userfiles/file/40450219936.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085048114edb---zewifipemasarum.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/rufofutinifalukadezuwix.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607857f69b369---99511110541.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/70fe81e4c1e49d92a26992894f34027d/94208549357.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607526ed532d0---wegitatamorizizeruxak.pdfIn PDF document text
    • http://nusamulticentralestari.com/Uploads/userfiles/files/50165841160.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dejik.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db85edc529e---77761292554.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/86629018841.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/nixijikovexaxewumomon.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607792100ceb9---pewolakemudida.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160774fea86e15---62012813774.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/5400889349.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160e0a20fbe418---zupuwoxuban.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11aff9f319---kosugukovefa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ayer+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d2cb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD2CB 18500 bytes
SHA-256: 5ff481bce31b6c97ab007c2bedb584676cb3c468d832179de3b116ccdb77da03
font_01_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 10104 bytes
SHA-256: 0f9fa6bc52deb04eaaf119cae97a7c60e75b651ef9c750f0edd186ed1aea6961
font_02_sfnt_off00010747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10747 4180 bytes
SHA-256: af39149eccf2be8636d7084e569eea7ea6096ba3134beb024a2491afaafb2487
font_03_sfnt_off00011701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11701 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00012f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F13 22596 bytes
SHA-256: d106ffdb7bff8390f64d4bcdc99fb76dcac37877c975f6a77e8b0b7f0d863141

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