Malicious PDF — malware analysis report

Static analysis result for SHA-256 85afe53c80df1320…

MALICIOUS

PDF

71.4 KB Created: 2021-09-05 19:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 01adf6318f82043ae822c7e4ca5ac897 SHA-1: af429cd2addabf7f223121d7af83d75c2bbcbd13 SHA-256: 85afe53c80df1320adfc679cced6f88965be13addafcf56342d0ef1d27f47079
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 compromised WordPress sites and disposable hosting, suggesting a link farm used to distribute malicious content or phish users. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a55454a131187a8a9a30c78dc9d58731/72104045369.pdf In PDF document text
    • http://distributoram.com/files/file/vozuzemize.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/wigazawanokav.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9ab727c18b7c6de1b64fd5517a8a3754/21895186972.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/84400060725.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/godufedewakipuf.pdfIn PDF document text
    • https://migger.dk/userimages/file/98886925575.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210809_F22AEBA75E5C4DB7.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/fufatesomabodexozedafegu.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610d16ec16491---22558076400.pdfIn PDF document text
    • https://baptistfriends.org/media/77551304691.pdfIn PDF document text
    • http://stylekd.ru/files/vivipanamaxorosutuninow.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/gupamifizeta.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/71908967ce47c8170751db0fafecd0a5/fipufi.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021062407001494.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160983fa414838---bedorofoti.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722fb4ea5fe---12247183924.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a167af8a90a---jakukemenozu.pdfIn PDF document text
    • http://zenobiacultura.it/userfiles/file///zibuxovebugum.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/75a069c10b512ed5585395016b685c3c/gerazikopejutamojilife.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ec2e1ec39---67801469024.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ec9929e05---vasewe.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/2577079122.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/kukewajosadofamubeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=falsafah+hidup+hamka+pdf+downloadPDF 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_off0000b73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4D 15948 bytes
SHA-256: 75604cfea7fde3a00a4d8cfc4436db509355ffddb1c98e253811fd2e82000136
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10688 bytes
SHA-256: bb74a55c161ee8d686bcd4351df75b689c6ed6fac59611718d5c25953eaa782b

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