Malicious PDF — malware analysis report

Static analysis result for SHA-256 2123d1ae2a52cb94…

MALICIOUS

PDF

74.4 KB Created: 2021-06-24 14:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 6be4bb2df6206602ecdeb6850ec99ccf SHA-1: 211c24861c3aba701ec0d07376b95a31241d6e52 SHA-256: 2123d1ae2a52cb9472ce763472868087115bfdd3a1793f764a2a4871ef91de15
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links to external resources, many of which point to compromised WordPress upload directories. One high-severity heuristic indicates a link to an algorithmically-generated URL, suggesting a malicious intent to redirect users to a secondary payload. The ClamAV detection and ML classifier strongly indicate this PDF is malicious, likely serving as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/9d216eba84ec368ffccb4d531cefcaeb/jarulexewiwafalokokawu.pdf In PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/nn18ebsvp9kaniordscvobi189/papukovawamasivikufa.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1ec018b438351a000cea0969fcc73041/zowefo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c7cddab1993912784fee015a9ddd919b/zewezunesixomal.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210508232012.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/63594930350.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca56cf373---puxukajigomovelekigedugeg.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/rofuxenexepinijapatekale.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/2530002468.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/gukez.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094395de10cb---9807680338.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/niwepefa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/9k6mlcpjb708cbqvlh12duf2l7/fefetigaxo.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/fj6tvau7eha527b9elnofqo4kd/rodevavatulusajidelo.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/mafigunepubadu.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/83573425000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=safety+connection+crossword+puzzle+answersPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE463 5496 bytes
SHA-256: 7ae3543623e5adb72adbf5b9bd77d99fdd39bf04b2e98a3241ef143012e5ca98
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 10860 bytes
SHA-256: 62b1bf54e57960d1372c6a8eb6a669f8c6a49538d80f878c608d66e6f37b747e