Malicious PDF — malware analysis report

Static analysis result for SHA-256 72f4571f1b4e8b45…

MALICIOUS

PDF

89.2 KB Created: 2021-09-03 19:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2325a3fc5aecb42fe36ab15c9a87dd01 SHA-1: 0bfbbfa7c7eb4255ea3ecd474899df479e11b108 SHA-256: 72f4571f1b4e8b453492739b1d6f68bb2b9239897bb15bfac86dccf07d6168de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to websites hosted on compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gu0r4kj2n83uhqpvc2btuc42ch/lefelexanefeb.pdf In PDF document text
    • https://mayphotocopydogia.com/upload/files/92760255135.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3dc4ba83c---kudebofi.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/61348160491.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/ribi2uptkoduiueqj3t819rvb2/xaguxepim.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/26692327720.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607757a8a9051---xoputefupejitefuzulis.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d6fb4934b6906237158bb8733a602197/gefofufiparilesom.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/741e0759bd1b1f27c61ee0d911d9791d/wuvilutox.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19506577901.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/wulakisomipama.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78183a1783---xitekolejipidizavoxosawik.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/4953114238.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/xaviwasuzinop.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/bffc508b7b805864c91446e682ddcd1a/setaxenepewuxus.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/sepunobuj.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/4734966064.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb260caaabb---3902319329.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/29537788995.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/6mmqgctjjmie9l80abs9386539/gibavimadagedej.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/99798225944.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd50c56f8cc---98674540676.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16129f4f12bd37---kekapumerolodi.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/18063152611.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b0e86r0u7c7earer53vcchnoma/difizufaxivepisori.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/38559555540.pdfIn PDF document text
    • https://transpack-krumbach.de/_upload_bilder/_filemanager/file/60801223996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=walk+through+metal+detector+manualPDF 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_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 19320 bytes
SHA-256: 89d62703d1d284f28ef5efdf72aeda20bd643bd222e6fc6ad7caf54c8c6a3540
font_01_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 10740 bytes
SHA-256: dba25704ab32ccb216d50ddf97ef76a50f3a6c88708d79df56ed51e1a55dfa10
font_02_sfnt_off00013f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1