Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fa09740b2250ed…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 09:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b5b12d2d859d1adfc0f86cedcf2a50e9 SHA-1: df8469107e0e18f49ca7a2292fd0963a137b766b SHA-256: 88fa09740b2250ed70eaeb594282e03d1b5714d7afa9918453343b038178d9d1
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV also detecting it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://bc2000.order-pro.com/ckfinder/userfiles/files/90928568522.pdf In PDF document text
    • http://deleersnijder-bocaege.be/images/file/povufuxefazudavojikiri.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d279930382---fuderupedupawefip.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/lenemasolunusa.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/3966847525.pdfIn PDF document text
    • https://aashianarealty.com/file/vamarugorefojidavadi.pdfIn PDF document text
    • https://lecachet.fr/docs/files/javugosofarutito.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/03v4u8jp3njgmpv1hrl5592ui3/48794404590.pdfIn PDF document text
    • http://chapelguild.com/images/usr/xogetino.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/11719a6be1f36e50577a0afc3e8ac8f7/kudotixorumebosedobevu.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/naguxamikedomilegasad.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/sinudem.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/50216891827.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/luwawutejogowawas.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/84478445981.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f1e5692281a5f3b5ff9f21642916f182/70052175983.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabbbf4febb---99810034144.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/vozinigesenajefomezar.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/fudidu.pdfIn PDF document text
    • http://smitheaster.org/clients/861344/File/selaza.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/sesimat.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/nemawiluvibabi.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c415c1df38bf7b9433bc64a8897c2a9b/wemubejikipokowukezug.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/tujizowojavevivofaz.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eaba123bed---20871939672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=smart+agriculture+technology+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_off0000e8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 11188 bytes
SHA-256: 345ed3ad3c459cc9f0efd87cee2f234ad098b8100e66d9c7e3ba2dbfec0c642c
font_02_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 19176 bytes
SHA-256: 872dc1686a59ecb73e16619306a28af8e3fe18570f5d1d96f3cebce4fc0ee6d5