Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a3aa61dc1e1c54…

MALICIOUS

PDF

85.4 KB Created: 2021-09-05 12:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56a0dd0f25ee24236d5c5ea5d31d5aea SHA-1: 03cb117e247afe2239e98c1ba5b622a97a545287 SHA-256: e6a3aa61dc1e1c54b1eb2ef6d5e5c62da8bb14deb9ee15093727150a3246f724
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://marosme.ro/hirek/file/58541729804.pdf In PDF document text
    • http://www.bandungmesin.com/file/25155938158.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/dajujoxo.pdfIn PDF document text
    • http://camwater.org/media/files/45446323450.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609880842e7ff---fipalawowud.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e5fcc554---lifor.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/d0264709895071e30918f1cb99ec39cf/89894521255.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/18789936328.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/73c1cc214bec51c09ed1a2f370c8fbd6/pixokifasopo.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/wadefilalozex.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/98387357885.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099059047089---68785216492.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/hcubkv19t389vumgaoojr1evlc/fepuronelebowugakasumet.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/2500506f76777560712a14bd764d3403/dosojajowisumonakaruraxad.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/17502086378.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/84440544454.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8bf050512fef3845e7a7ecf24bbf1fda/rajizaketaxobuzegarelew.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/xifozijopalewor.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c674dbda521---filomebume.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/14618770451.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/letuzegigomufurikinolilu.pdfIn PDF document text
    • http://chichen.asia/ckfinder/userfiles/files/78164590891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=numeros+em+ingles+de+1+a+100+por+extenso+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_off0000e061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF878 11192 bytes
SHA-256: 268771b5754aa302993e1ec7dd46441003e0c1d8727e19d40c6777c6a8c820e1
font_02_sfnt_off0001127a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127A 20700 bytes
SHA-256: 57098c1d2b86ff87d7c4b3ec62c22ae20212c4d8e84dcf199f49af228b1976f5

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