Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0dd03163f2ff4f6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-20 03:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5398339d2897b81cf17b13a70709b80 SHA-1: b0c80bcf793bf6fafc6bfa083b4135b9b9814b00 SHA-256: e0dd03163f2ff4f64f026fe062e66d823af20870604b6e49e119803f566f5cef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://saopauloairporttransfers.com/ckfinder/userfiles/files/96208179236.pdf In PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/nixupezodebemepene.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/mifebenezudidoboze.pdfIn PDF document text
    • http://tercovci.cz/files/file/5896825289.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/lonopogubigemotugakemul.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/2862087323.pdfIn PDF document text
    • http://sinching.com/uploadpic/files/202109152245277605.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-5/20210905025725886275.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/31217955450.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143e78cd38b8---13958355893.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/wixipevemoximokujerumox.pdfIn PDF document text
    • http://suurelepa.ee/data/file/62299887733.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/suvufexixagoxitij.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/divexonanuxirud.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/tifokoxuf.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/56548140647.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/vezujobujetufipasozobetew.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/dovikerema.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/tufiz.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/d0cbcfb9e1cf37544d786e06933b96d2/70089238963.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/juzizilegu.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/58568123388.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/xuzil.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161467b68957fe---xosodiluru.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/73726438733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=android+18+x+cellPDF 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_off0000be55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE55 17372 bytes
SHA-256: dd4b19ea1433a42642c4054d78be98079923b6741412b07fad818b75f8ebfe35
font_01_sfnt_off0000eb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB70 10280 bytes
SHA-256: 83c0be2743146430289c36789c072eed01f04c76a10fa861ef41f66ee73b38d0
font_02_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1