Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b04d1b2d5b2022…

MALICIOUS

PDF

76.2 KB Created: 2021-09-17 04:52:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 57c366bf099a3423c35bb74182c81b2b SHA-1: 3b1c38bfdf7e5e95aef5ed9fc220bf401c6eec22 SHA-256: a7b04d1b2d5b202215eeb3f471dc19d7a54abbd7ba798eb358040f8add8813b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate the download of further malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=polska+gra+android PDF link annotation
    • https://adeptos.clevercloud.pt/images/items/files/xujipusovozuza.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/36965459101.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613904f94bc1b---52743993938.pdfIn PDF document text
    • http://orthopediedelft.eu/files/kafinorebazujitulovak.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4c6d01a4873ea5d49980bb9747ab12a7/64589230443.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210902_3C0773B465E5DB54.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/56nbfceho2uf80monljmopl84p/befudadatifekemaxota.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/tasapile.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sigajixirub.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/pufedavalafafenofivazalam.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/sanif.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/34890941964.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/79637684182.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/wajajul.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/nijodojotuba.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/7985066994.pdfIn PDF document text
    • http://geotersrl.it/file/jawexakugemu.pdfIn PDF document text
    • http://coherence.cz/userfiles/file/lepoge.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/fimeragugifijivege.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/tavarusaxuwutov.pdfIn PDF document text
    • http://feg.vn/uploads/files/mevuzubogetasozejipez.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b999d8d53e---78267138106.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210908080038.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_off0000c562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 10284 bytes
SHA-256: 1f51be05980c23ef015cca4ea92940bbcb6434ecb52f130bbbc0173a329b8a36
font_02_sfnt_off0000f475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF475 18424 bytes
SHA-256: 322bf029167981e6e732faa2500a707a563b072d0065bf1b80418b8b8803e094

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