Malicious PDF — malware analysis report

Static analysis result for SHA-256 66477efd22b87515…

MALICIOUS

PDF

85.8 KB Created: 2021-06-28 21:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c581daefc246503e9c3eace89d207db2 SHA-1: 3496baf6f0d891207ba0684e1a1cf404f0dca8f6 SHA-256: 66477efd22b87515f70bd7245366ce26c5b8eb0db18b6b485e2c9efb9a3f3152
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites, indicating a phishing or malware distribution scheme. The presence of external URI links and link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://adamlegal.com/userfiles/file/9627361623.pdf
    • http://biomassasia.net/data_ed/userfiles/file/25323242895.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3dce05fd933292807e7e6d173411385b/kizufofegegobifabejirelad.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/afc4666a0db030b53ab6cdb73f25bb72/puzuvugolugupajeb.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cbb07319a6596b48861fe166eb20bc2e/zofakog.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/234373f27298645efb5ea2eaea0733ca/62218967280.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/c3f37f8b3f137c35e5f5b6751218a1c7/91484536867.pdf
    • https://bursakaynak.com/userfiles/file/razoxiferuxabedato.pdf
    • http://31kouqiang.com/userfiles/file/1623520484.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d173cb8853---41166899090.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b128a3ab1d9---80036449829.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/15969803923.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c4449bfe---1241830867.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210610_D6D96410F393CD6A.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/92141122878.pdf
    • http://hainescentreasia.com/images/file/58470367099.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec11aa04c1---dotikapel.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/f2u293267sl4k8128itadlnha4/35922185194.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/zupulakadak.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca8e80175---72178371317.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210609165835.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b06ba66f1---2617401490.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/3e62e184d3a4f5054bb2b1c35e547af1/wenuzoti.pdf
    • https://klairtransport.com/uploads/files/sifemekulifuvop.pdf
    • http://akgikorea.com/file_upload/fck_upfile/file/61589159563.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=asus+manual+for+tablet
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edfc.bin
0ec5a17bd565e8bd93a9af5f943073b8ffaf082bbd82dd0fec97dee07113c978
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 17168 bytes
font_01_sfnt_off00011afe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFE 16792 bytes
font_02_sfnt_off00013315.bin
54ece83a53d59eb718253ff872da618ed2666ede9830c2876aa506af3df9716e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 10504 bytes