Malicious PDF — malware analysis report

Static analysis result for SHA-256 34e5f35ba8535271…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 20:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5556fc683e608f7eff141c5c145b1d9a SHA-1: f00531d293d2ef539c6512752a56975b0870cb7f SHA-256: 34e5f35ba8535271a0b1c56790a639e57b7d3a759dc0940412be809a8726e6c0
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites that appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farms suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://poaglasses.com/uploads/files/202109101610512274.pdf In PDF document text
    • http://jtylek.pl/Upload/file/80351271885.pdfIn PDF document text
    • http://xhzhengli.com/upload/jasurododapapukonuje.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/xuvutesafijoteputaj.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d860f1ff8b---migubufilawamuseroxigomob.pdfIn PDF document text
    • http://519pf.com/userfiles/files/77274659956.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/1938496591.pdfIn PDF document text
    • https://shastriratanchatterjee.com/ckfinder/userfiles/files/57995252911.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/44504427744.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/govik.pdfIn PDF document text
    • http://citranco.com/users/files/23260681736.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/lekojalidimadowavibimekuf.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/h7q0mavr3mf04he13p5c8uv9ie/mowisesexuboxoturenagoj.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a60daa838---95956137281.pdfIn PDF document text
    • http://daiichigroup.net/uploads/news_file/xanimoxefamolenidumafogaf.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210902091246.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/31277184923.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/gibimixosanumif.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/rijinarowife.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/87191905360.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/92136052554.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/sajobemotepaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=watch+dolittle+123moviesPDF 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_off0000df8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8B 18680 bytes
SHA-256: 505ae38ada3fae999e3e2170b40b99aa1e83fc7b96b32aeb98d858f1f285cc76
font_01_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12805 10836 bytes
SHA-256: 088f4db4c2458c05967b1bcf7b40691d40f2aea1f1151b6166be2c951a480f66