Malicious PDF — malware analysis report

Static analysis result for SHA-256 874c025bc44b6386…

MALICIOUS

PDF

74.1 KB Created: 2021-09-28 08:46:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bdb2cb67b76b681e6957ce75b2a4134e SHA-1: 0c574f82e25ad72b068d1663fb404852f0afa328 SHA-256: 874c025bc44b6386b881c2e35f551bd61c630daa551da309a57a6abfbedf6daa
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, specifically utilizing WordPress upload storage, suggesting a tactic to host malicious content or redirect users. The presence of these link farms indicates an attempt to leverage compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e69451c71---65828665037.pdf In PDF document text
    • https://www.patisserie-flechais.fr/ckfinder/userfiles/files/zivisuvajoxu.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/38526270583.pdfIn PDF document text
    • http://thailaundry.com/imgUpload/files/xenofosujuxizuvetulazoko.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210912_62534080C0BE16D9.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/19945301854.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614daca3cf1bc---16749681054.pdfIn PDF document text
    • http://konberdbio.com/upload/files/32335742541.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/rezanabatenufevemifoze.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/87281665007.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161332b7061d48---xunuwumaxomazuwog.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/87020805214.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/ragurarukunu.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/84542059400.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/67384477769.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/nejeti.pdfIn PDF document text
    • https://abcspain.tansis.com/userfiles/file/fumaxozoneladom.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/39087595176.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/14098038466.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161408ecc75014---kaxes.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog/file/10697686324.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e0f8f28a6226291c71012e2c1cc6308a/mesukuvosuja.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/nukanubililadi.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-25/20210925001804939086.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/moponexofuvariwanepaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+owl+house+season+2+episode+2+watch+onlinePDF 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_off0000bbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBC 17992 bytes
SHA-256: 42d55a56c0c5b403d2ec652c6147467f546a0f626d9a8fecf83399c6f4328bc0
font_01_sfnt_off0000e97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97B 10780 bytes
SHA-256: 0cb5f390ceb3792a083766fd60cc596b4ea4d1a111f69190b96d289bb1ee8561
font_02_sfnt_off00010268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1