Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66ce38259ac3055…

MALICIOUS

PDF

85.4 KB Created: 2021-08-26 06:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 92729b525214b55d12390e579fe13af1 SHA-1: 60379cd3815b81ba632b49f612b166b290c82405 SHA-256: d66ce38259ac3055f1cd91bae71113ff29b8f6f0daadf34df9f9bfd2d287d39d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a tactic of luring users to external malicious content, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=stock+valuation+pdf+notes PDF link annotation
    • https://kristinanamaste.eu/files/jodobuxigene.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/e20a77f50f2f7fc65ec61bb3fb56e00e/88332808709.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429154338815974.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/75207387940.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/kobunokimojerume.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dca882a0501---33980842429.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4b578f4a374d9459b830a7dfa6bbdec0/lofetameno.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073d91969f25---45135650041.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4eb984c765---setirixawi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/57eui07ns8mbt3uu9e1j9vc4s8/65873034679.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/291d222ebe12bdae91aa6e30efebbfef/29725765307.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/sigokewigo.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b708745fe9c---puxoxojikozonuzigisof.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/pugetebezano.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/zejonobiposumexu.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/rodomonavago.pdfIn PDF document text
    • http://qdjshg.com/files/file/bisetabutalitavosute.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079561d6ac20---vilewatabep.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/32692809831.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15bb82f98c---16958135632.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/3koc9374r6av8fu6ijdtbg2av1/45845228817.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/10620180998.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/kogawejufisugunezen.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/kudisavozutofexusub.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/xudilozamoruje.pdfIn PDF document text
    • 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_off0000e9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E2 16940 bytes
SHA-256: 3c379e1adefcf4bbce541bfaba98720fad1a1827cbe7a0b814174993b53f636d
font_01_sfnt_off0001163f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E56 10848 bytes
SHA-256: 60ceeebd1bf971a100ff5ea6fe27a88c70b27b34d87ad4eefcd663bdb19c8f27

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