Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc6261aeb9807d6…

MALICIOUS

PDF

74.4 KB Created: 2021-09-14 02:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6c22598d78f11940b83f4d27810bece1 SHA-1: 821b84efc509bfbe3b2a088ead5493cf752e830d SHA-256: 4cc6261aeb9807d6ff7bc0f7500deb4292ed0864e4f807252dda0da34805778d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple domains, including compromised WordPress upload storage, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a malicious intent to manipulate search results or distribute harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hostingureitings.lv/uploads/userfiles/files/85466869528.pdf In PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/mexul.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/27338090436.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/154309980561394bb44c6a7.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4e5eda1408ebb6fc9bd7e19c35d549c2/28745221479.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/37448659807.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/tolama.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/gabowavixubizogejot.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbd81555f---66952917413.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/96804290153.pdfIn PDF document text
    • http://belovosushi.ru/files/78966803185.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/91247884258.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/2523367411.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/gedikebibiporasididosoj.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5e6a9449447763dd5e23db682278f330/59083288660.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/zilunaxap.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/15736281065.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/63118972565.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/62296011704.pdfIn PDF document text
    • http://ergakiland.ru/files/files/77478371934.pdfIn PDF document text
    • http://apismorava.eu/docs/10031357592.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613de3c9da950---72801511969.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/rikuv.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/fijifizebujejokokusuki.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/gelogimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pokemon+emerald+randomizer+nuzlockePDF 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_off0000beb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 10520 bytes
SHA-256: d2dcf781b99889a2aca2166da4cd1e44bbd84c1a7f0df969f6374ad5724ab80b
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 17492 bytes
SHA-256: c9125e15f0fbb410a19a46597f598c6003a32174044c7169c6cf778e496df9fd
font_02_sfnt_off000103ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1