Malicious PDF — malware analysis report

Static analysis result for SHA-256 2362233e65ac3c94…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 08:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 04b59d90ad82d32b9e50be695ab9045e SHA-1: 1424f8ae103124da80531786a472f528dfc935d7 SHA-256: 2362233e65ac3c94de7454d273faa02564140742614a260e843c54bccc33de44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on disposable hosting and pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://garglob.ru/uplcv?utm_term=critical+ops+reloaded+play+store PDF link annotation
    • http://balone.net/_upload/file///1353805767.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc96517a4d---javonewegoronu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/b091971f7b4d1e15f15dd9ba6bfd9dbd/42040424737.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9a77c26f2---14045026995.pdfIn PDF document text
    • http://wohingltd.com/userfiles/vusini.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/ita7j7crblbq6o802gh72dgd0f/tefitosizisude.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/68577675278.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/kejaxuzurexu.pdfIn PDF document text
    • https://lazerom.pro/media/file/776863536.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210909181809.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/44736345364.pdfIn PDF document text
    • http://bjjiffy.com/upload/nabiguweduzipoj.pdfIn PDF document text
    • http://cold.lt/userfiles/file/82141934714.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/29645330009.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/72715892385.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/birukuvirovanovavo.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/44738833509.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/jezupuxar.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/12350206862.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/94102576215.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/98159620302.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/57a100aa8940d8e43d0253f0b931aab2/tigepek.pdfIn PDF document text
    • https://www.albriug.com/static/editor/ckeditor/ckfinder/upfile/files/digofinegik.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/vufizuwuwivejotuzerekegax.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_off0000bf21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF21 10548 bytes
SHA-256: c46bd9117960c2644e6df9bcb5daf6ba5e69c98f8bf459cf01433cae23d625be
font_01_sfnt_off0000d757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD757 17036 bytes
SHA-256: eb75f1ccc0220913f0b129f9140cd7df1f5f3bd1467871a4d04117bedee4c851
font_02_sfnt_off0001037a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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