Malicious PDF — malware analysis report

Static analysis result for SHA-256 226d31974d4d5154…

MALICIOUS

PDF

103.0 KB Created: 2021-08-08 19:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ba0d3a61e67f393e920c7df08ddbca12 SHA-1: 4638f7256e5002047d5b92f49990d99731bb6ebd SHA-256: 226d31974d4d51542fc1ba68d59f4683e6b9d9b4579647ba0043fe8ce25a216b
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm used for redirection. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9856

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://savitravel.ro/ckfinder/userfiles/files/58627654498.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3066c0f84---desiwogetani.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ee2c2ec93a990887a16f8ded71a8cabb/47988553866.pdfIn PDF document text
    • http://milkexim.ru/imgeditor/file/wunesamapa.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/jokamigefawibuxik.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/prlnh28d4tc1c4e0na9u4k0g38/7340203290.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b50449c3011---72870860502.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/26659363430.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b9b212eba7e9749c4145ce5be1b4f955/gunomuravizuxosivodunusa.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/95924419541.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://abnicum.com/files/file/sizudofofotima.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/24673909334.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a706ae4bf---riwamukaretetoro.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/marawajugaro.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec7f88096---juxutafoxojimerol.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/pixizexaxananar.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/lazebororulezej.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/rineruxanuriz.pdfIn PDF document text
    • http://axwelindia.com/uploads/2858131972.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a608e5d29816f83ae6ba00104adda103/95718004928.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a985634e531---46222002535.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/jofd37jttg8kfl3i66o303vtou/70607988352.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/mezavifetugaxetajasururad.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/givipifukude.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d435a0a48eef8d1662e414bd100735a6/31144888825.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/05d3836488384b0c0e0937a45eb8b028/40803036895.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/97853186772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+four+agreements+summary+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_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 17528 bytes
SHA-256: 9fc86f1bd2a7794bd6e1ea0a289ecd91a45ebc9beaa14bd643342d2011b9cbe3
font_01_sfnt_off00015a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A22 10984 bytes
SHA-256: 30315df1305bd35ddaeeaa62f6c445d1ea653ea5d9f57b4a526553e22764373d
font_02_sfnt_off00017357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1