Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5c9dabeb6cc032…

MALICIOUS

PDF

83.6 KB Created: 2021-06-25 17:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9cd85c64e47da04a43a12c91bdbf272 SHA-1: b4d8050540abe50da75a740f5524a4c0aa9391d6 SHA-256: 5e5c9dabeb6cc032c8d2999b814b3c993ffc31bb4aafad11d5ef4e74845fe16e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards an attempt to exploit users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608feac591175---lavikimuduvomawuranazuj.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f0949228---59510896593.pdf
    • http://wernitznigg.at/files/womimuremoxubozot.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/dorumunulolurilerategu.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071054b70d5a---48405881783.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607afffac3875---95892256851.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd4cdaa01---12889002369.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fjt56hk0scpdk9pesv31hia1pm/71706410394.pdf
    • http://polkovnik.su/upload/file/6248847967.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c0cdb5959---juzexipuneratilago.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160892f898aa5b---mitila.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/4qev5tvus2iqsrati4mggfvdq1/23683102786.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/japapilelafogevuveseve.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/sazijogulopalajarinan.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a286cbcbd59---30817756382.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffa74c3f8d---beripedenoleb.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/eb168a593b2b71d9aff5086c17e53b78/nomoboxofasisitera.pdf
    • http://hyderabadibiryanicorner.com/admin/images/file/75346584602.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160807b678d662---80976691695.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3424e05ea2---safutamubufonoxopi.pdf
    • https://hgb.se/filer/file/mafunujuzokomisumopibome.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/38188755e0664288e3963930ffd08039/74713681087.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=russia+phone+number+code
    • 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_off0000e108.bin
fb760a53f7780ee2339d463e2a382b41c8882719c1b3ddee71c0fa207484466f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE108 17396 bytes
font_01_sfnt_off00010ebe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBE 16792 bytes
font_02_sfnt_off000126d5.bin
16558b248997c977029e867df4bff8c4c51f170233ced8add4f2817da812c603
pdf-font-stream PDF embedded font (sfnt) at offset 0x126D5 10920 bytes