Malicious PDF — malware analysis report

Static analysis result for SHA-256 604610bc69719b6e…

MALICIOUS

PDF

106.3 KB Created: 2021-07-07 11:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2b8044e5bb60a122bcdad4998caac5a SHA-1: 70ba2ec020ea71f7b47795150d3b27bb9ef4827e SHA-256: 604610bc69719b6e1dabab14dbe68e03bd42e0642eb52f6dbcc2137e99c4e39d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. No scripts were extracted, but the presence of external URIs and compromised CMS uploads points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://smidgel.ru/uplcv?utm_term=features+and+significance+of+the+theories+on+entrepreneurship
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e259bcb80---4936734480.pdf
    • http://aarogyamedico.com/userfiles/file/6391760100.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ausd4ktd4fbpcqsll6t5g4v12v/47366230054.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe58e1bc84---jebip.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/de557ed41cb6369ca3058b0ba89c89fc/xupujujex.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/87135847294.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d06e679d---zovigujatiteli.pdf
    • http://ztkammer.at/uploads/file/mokarorowi.pdf
    • https://ovth.ch/userfiles/files/liwiwusow.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160825fceefafc---86431067427.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/9ca721ba13c4ce519b163c76b9d9dc19/lexivakaritugopajiwibozel.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/74988028662.pdf
    • https://aartipalette.com/userfiles/file/40947375386.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d328d58fa---77822114603.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5ceb6199d---gativezazo.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd7baaf02f---serene.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7961d1bbff---61049616992.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d466154ab3e---zazijewijofazukesodaf.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca47326c39---mezugigerono.pdf
    • http://ztkammer.at/uploads/file/guxilekamokax.pdf
    • http://udaybharat.in/ckfinder/userfiles/files/33586931765.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cbcb10469---89169360546.pdf
    • http://gursakaryahukuk.com/images/file/vinajesevul.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/23030345372.pdf
    • 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_off00013cbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBF 16792 bytes
font_01_sfnt_off000154d6.bin
be0f1733d907519858bd8a52fa4dbfea6192d44587e130f4bcd8a4a749140039
pdf-font-stream PDF embedded font (sfnt) at offset 0x154D6 10932 bytes
font_02_sfnt_off00016dde.bin
1966ed61cb0e9dc9c33265d6abbabcb0d2894d93cef1d672ffe61ed691bc5671
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DDE 16900 bytes