Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23a15cfdf2aa46e…

MALICIOUS

PDF

72.2 KB Created: 2021-10-01 06:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c9d33556d2b0333c8e2ea08ec28c01e9 SHA-1: 7b855858c0e26a5349c2aedc8a47e43cd81c2007 SHA-256: c23a15cfdf2aa46ec67013b29c68d42576a34a300f50e7f363162ef665be1867
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains a link farm pointing to numerous URLs hosted on compromised websites, including WordPress installations. The PDF's structure and the presence of external URIs suggest it's intended to redirect users to potentially malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://philabc.ru/uplcv?utm_term=kung+fu+panda+2+online+free PDF link annotation
    • http://merwepizza.com/upload/file/67756076698.pdfIn PDF document text
    • https://digireg.ch/upload/gibekerow.pdfIn PDF document text
    • https://pasarangroup1.com/contents/files/lenuxugizawibaji.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/jazusaluwovewonito.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/35740251866.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/vezudamatazu.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/50673771883.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/jijomakawonud.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1615401a411860---kobijisut.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/60069795117.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/14662839722.pdfIn PDF document text
    • http://wych123.com/upload/files/kurobog.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/89101255798.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/45688355702.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/2650043776d33b524c2e352653bd507b/kazekawesixofasuwom.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/teretimiriwudixetedi.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143124a9d31f---7062795697.pdfIn PDF document text
    • https://ms02bet.net/contents/files/3002430570.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/zitidazamog.pdfIn PDF document text
    • http://ocean-ex.com/images/blog/file/dikuw.pdfIn PDF document text
    • https://yam-token.com/business_school/uploads/file/xasuv.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/52407480007.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/pedatudopitopopumiwoxome.pdfIn PDF document text
    • http://darstin.com/userfiles/files/20592261274.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2ecc0b275---68451061599.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/rerajuxu.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_off0000b6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 17416 bytes
SHA-256: 9935691d6c714ef2383816ab1ffc5ac1c86f955b1eb9622d0f060d067e056b96
font_02_sfnt_off0000fae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10620 bytes
SHA-256: f29587c2349d7ae57c107289c4e1034d3aa6a47f51d67aba0db66347a9d23b4c

Open this report in the interactive analyzer, or submit your own file for analysis.