Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6f224e149c04298…

MALICIOUS

PDF

81.2 KB Created: 2021-08-20 12:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6a53cddc77f0b6036b1f40bb81987bf SHA-1: 4f7a7494d5a24c65ee80710d3bd230de4b750ee7 SHA-256: e6f224e149c042987fea8a7f422152b0321cd71e60e71c8612588cfdaf25db78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some of which host PDF files. The presence of external URIs and link farm indicators suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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=how+to+structure+a+sponsorship+proposal PDF link annotation
    • http://k1a.ru/images/files/file/6057811207.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/vadobekedemegebiwidazor.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/50074969844.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/navurebasadamuvikubikas.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/6j6eleppgm2i1s6sj4r4o9rtlb/kumajarepazavedaxiliwer.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/pukazavu.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/pufopunufonobasejotadetif.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210530014711154.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/721baf88fa6189f312a87e32b1d50c68/31100981044.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/rerosetizaxen.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/42543953988.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/27416401779.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cd873af6f---59584060222.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/41226299374.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/81074922178.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/49vn1k6r9t014rm5gqh4vdqdtn/43585916834.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/tixodofowoximeni.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/06vm3bd9c4ectbc9ego74asc4k/19332299991.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7f887b44bbc543a1024dd227c506ffd5/raluweditubobu.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d30d5c1a---36745020393.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/23948321134.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160895893c7705---dajetiwakebex.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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF364 10648 bytes
SHA-256: dc17ffc058fb9814f3940082d1de7290d52045a1d4bb8a801d833f7be1fd902c
font_02_sfnt_off00010bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBC 16736 bytes
SHA-256: 89fd95fd6fec198175e796c452325efed2e658bbee92ad342892a0e55248a424

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