Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15f5ce02063c81b…

MALICIOUS

PDF

106.4 KB Created: 2021-07-23 10:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 56657cc07cdcce5ec5d5736a61a52410 SHA-1: 286c7403b6c6d16cc97cec2c8c9303a438aa899d SHA-256: f15f5ce02063c81bc4b7920e17992e2bac04cb60bc95baf448b5276ee0d1e1f1
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 http://grapevinewinerytrail.com/clients/876125/File/pikuvevime.pdf In PDF document text
    • https://adasms.fr/userfiles/file/73999226044.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/047d76c8f7bf0976f4519c974c2b7935/zuteronawiwudet.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/89926313567.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kiwedulume.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/67525605191.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/dadodapem.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1fa5b9ba4---tusalatenizaxeduvadonoli.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/51832828330.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/28114409026.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b0df79432---duwumuzuzefoni.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/8877991841.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e921e176e---5990250540.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789a9b9b69c---46107076972.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/vefevidovebimet.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/56152252554.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a10414d24---74092677554.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/235a05e08a95dc63ec29d193e1559844/pexewitivexivefuperena.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/bekugebivi.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/74104487615.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9bf0349f109ece91f10bebea0d5b35ed/5732441687.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/19888171028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=treasure+hunt+clues+for+bedPDF 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_off00013db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000155c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C8 17056 bytes
SHA-256: b247da9287c3cd96fe9a0ba6dd45aaa8b896907ec270a20830bf245d796bef82
font_02_sfnt_off00018259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18259 10684 bytes
SHA-256: f4f5d6f7ec877b3e7c9a4acc39f6dd9cc00be505094b565db708938ca47bc3b2