Malicious PDF — malware analysis report

Static analysis result for SHA-256 96362910d88cc962…

MALICIOUS

PDF

77.9 KB Created: 2021-10-31 04:26:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 23ff7bb5e1e7114b8f80acd01e199455 SHA-1: 8c1a6dd22eea8b5fe67d8492c303e144e691f096 SHA-256: 96362910d88cc962ad9e284f445ad56c9994d7cbbd7b599a5e597be40da99115
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to numerous PDF files hosted on various domains, some of which are associated with compromised CMS uploads. While no scripts were directly extracted, the nature of the link farm suggests an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://resurrection-life.net/userfiles/files/tamepazovu.pdf In PDF document text
    • https://www.servicespace.org/inc/ckfinder/userfiles/files/95001256491.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/25917733552.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/77270455333.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/n9fvank93slkpds2f9plnggrk3/77892237758.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/65863713947.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/tebuzejanevudozo.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/54894283803.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210929075034.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/pajanivimizipizanototop.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/sezakesosibusanemeselasud.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/31450517880.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/velakisaloduvusis.pdfIn PDF document text
    • http://kmsenior.org/file/files/55177581620.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/70724845801.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/fc1me9lkupvdqdnuanpno7285u/jogogabivemifuxawad.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/r587jh4tpa0si9atc9qc0l9nr7/repotazoli.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/texuzamabatiduxijeposezib.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/nuxeluguluzamapoz.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133b73ab98b2---furibitirorizupop.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/33178605402.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/14119128506.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/11538323471.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=it+request+for+proposalPDF 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_off0000d298.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD298 10352 bytes
SHA-256: 3acb1aeb8aa83c15d3b24b9d657e0c681c080b6f9e8968cc7c998fd9cf0cf5be
font_01_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 15428 bytes
SHA-256: 83d699059d9fc9b34593e677e26d516c5d1233fd36f89683b14520fadb312eb7
font_02_sfnt_off000111b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1