Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e572a42b520aeb5…

MALICIOUS

PDF

108.6 KB Created: 2021-09-03 01:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f273f99079d2bd95afb792fbd9cff02a SHA-1: 6dd9cd8b71a7a05a8674d586a7fca4fa513371aa SHA-256: 4e572a42b520aeb5b0cba93dde9f78116fc2f0574d026e512f3baae464ef67ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious or phishing content. No scripts were extracted, but the presence of numerous URLs on potentially compromised sites indicates a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c6174d003d2---rutakuluxofekedexokasu.pdf In PDF document text
    • https://aimhc.com/userfiles/file/14215155324.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/mijuk.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b947a994fd---19197671793.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1d089b0a---tuwemixugegilisabav.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/71405943697.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb17cd0397---12105940573.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607db88c33657---45960850876.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/cc90f82e55da2e87a13dfecf05679587/bigatisudotororiga.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/xokaf.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/fapototoxajunuz.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c99a8a41a43---28334035153.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b5079f728---92595112074.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/96385953222.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/25845920621.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/8fce062m3sv0ogsjdfnpgoo7u7/mufisogepeziteposami.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a9475ecb312d956e1069280962672549/82482603037.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c6839d3b10a19ac9836f9ce3ed22c3b/62606490934.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/mosizufitogubatiwef.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/99910548524.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/zuwudos.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081213837580---kikipemozafejen.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/7965012635.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r5e97hse7euel7jaqlqadtojm4/45882993684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=group+5+sponsorship+canada+forms+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F5 10880 bytes
SHA-256: 4bee6c65febab43e645ae3fe72eff403b61b15b8c61947508df40e616c9ea211
font_01_sfnt_off00015bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000173ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FF 18520 bytes
SHA-256: aba362275f66ca2f282b12ea4688a42b35fff973ebf6c26e910d9fb1f21e71a7