Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d6ff4f43bdbc59…

MALICIOUS

PDF

81.0 KB Created: 2021-09-15 00:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c2619b94b2d5a9f78b47b13df17f0a92 SHA-1: 44f2c3c58de28db3893bc32f45190a2e049f8164 SHA-256: 49d6ff4f43bdbc59c817224de4b6c8a86c63623cbe425258546ab2b7e5045ced
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 WordPress sites or disposable domains, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier 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-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://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/fonelulofetakavafomudekup.pdf In PDF document text
    • http://articolo17.it/siti/usr/foto/files/66374302067.pdfIn PDF document text
    • http://canvangdientu.com/images/file/37441919121.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8c299688be517508376d2b98576002e2/gokiduwaxipeleguwumedu.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/51036313412.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82508179a---pibelu.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/fefalepitofe.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/80540417462.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/kejaf.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/14328470509.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/31336481703.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/bawokirosuritexo.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/gifevujirebowagovak.pdfIn PDF document text
    • http://apicn.net/upload/files/27174739824.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b4q0m7j1j4ns65jnpv6lebrjhm/19465976764.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/97596399962.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/31349073418.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d6dd026a---wakaverosogulage.pdfIn PDF document text
    • https://www.nevjegykiraly.hu/userfiles/files/namadusej.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/74880909711.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wugiwekutukot.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4b2143395e957fe7c30299a1b60f84ef/vibonididamoke.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/3262134685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=harry+potter+dan+batu+hikmat+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 24184 bytes
SHA-256: 8b938b85fe60f172e41418542bf4f8515c3a92df67292bad51e91a3eee987938
font_01_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 10984 bytes
SHA-256: 2156d030d0064b5c1a38c21efb3908a5ffcef8c2bfcdf475d43d2ca6699f6075
font_02_sfnt_off00011521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11521 1868 bytes
SHA-256: 9d2bb2d94384256bb38bab4c3005c13f44a8b25eb5b232dcefe64ad24aae4b51
font_03_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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