Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90c3fc48f13d571…

MALICIOUS

PDF

72.8 KB Created: 2021-09-12 15:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c888a57bc0eadb5edd4a166640c6288 SHA-1: b35b9fc7f561ffeefc027574bc68956d0e7f99cf SHA-256: e90c3fc48f13d57112c0b167298b2d769b8c6435284575efc116a69c8dfb20d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://chcial.ru/uplcv?utm_term=ascii+value+of+capital+letters PDF link annotation
    • http://designbeginnings.com/upload/file/85816697707.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/jujilipidadejuvages.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/napalitobijabip.pdfIn PDF document text
    • http://getvisa.ru/images/File/86471687192.pdfIn PDF document text
    • https://dacola.com/upload/files/2092339347.pdfIn PDF document text
    • http://skncn.com/u/files/14441609556.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/on251tn3bem8rbtv5fvpapdq3l/lolixugosetutupite.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4152faa85d4cf812ae523952c46be9b1/lovevumovowopevizobuse.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/jetavo.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/54d5ebf05abbafca6c752674b6b31a8c/newidaf.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/53865343270.pdfIn PDF document text
    • http://kantipursecurity.com/userfiles/file/tejijunamixupunise.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/puderewomuxujoposajebe.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/80481072258.pdfIn PDF document text
    • http://agppi99.pretty-match.com/upload/files/18476825315.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/70105728356.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/53803305826.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/68293413709.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/51896979548.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/temokukuginidefixegiwisew.pdfIn PDF document text
    • http://touchpanelpro.com/upload/files/36819184634.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/biborurojoxegilod.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/48364484518.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/xedukowevuxomiziregixu.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/40601158267.pdfIn PDF document text
    • http://posuni.com/userfiles/file/1625769119.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_off0000baa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAA8 16376 bytes
SHA-256: 8c115e634fd84d3ae10aa915d8b9bc0edefb77db0c9462b35191c37c04ddc880
font_01_sfnt_off0000e4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E9 10516 bytes
SHA-256: 977d66180bcc0414f16d9829b1a2cec754382781c57de8a826f5e332c624c44f
font_02_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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