Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98309380cae9571…

MALICIOUS

PDF

79.6 KB Created: 2021-09-21 11:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0ecf71bc54d88d32926fc8667cfcbb69 SHA-1: c05cd2e61d58684e2e5b8f5c0e5499ec9ca8086a SHA-256: f98309380cae95719a102d48732e89c4e13ce804ba9100c480f2fb7f88e475d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=norton+antivirus+android+mod+apk PDF link annotation
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161460f262ca3e---15758844325.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/7789498305.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/poxamevulepovobigefexo.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021091223512480.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/12613216949.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/33286734297.pdfIn PDF document text
    • https://12shio1.com/contents/files/66719374198.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/jutijonuwikobofezeg.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132c8b0af9db---38360213782.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/78510683362.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/77100047092.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/busokiwosovikib.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/4cf8cd6c27b8e988a90cc79300101e7b/xenutanakaf.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/teloxidu.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b8b96480df90948d025a03a5eb0ea996/wapurinogatotodixuzite.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/33da335966809270df743cd0a3e77264/4512979843.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/78449568356.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65d79f15f---10707030517.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/puzodijujifoguditara.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/28298667744.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/51963380340.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/48439246908.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_off0000d103.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD103 18424 bytes
SHA-256: 9147ddf21dbb44deb4f7450d17e3644e42535d83442786088d3d465d9e3b2d7f
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EB 10612 bytes
SHA-256: 0ab60451c7910172ab13b20e6758db88e7676a77e0081d8571332e3cc775c27b