Malicious PDF — malware analysis report

Static analysis result for SHA-256 578cdc8c5890ced8…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 17:58:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 87034f11c821e44b295448c3cb52b230 SHA-1: 7261cb6e3ea00d3210ecfe5294bad6689565d6f4 SHA-256: 578cdc8c5890ced80b1e4ff97207be67e83d2e838caa6f17978d73c03c37cfd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to PDF files hosted on various domains, some of which are associated with compromised CMS uploads. The presence of embedded URLs and the link farm structure suggest an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sindonis.com/userfiles/file/1985556819.pdf In PDF document text
    • http://worthingtonpark101.com/userimages/buwajedumexezudefuxo.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/bavujew.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/bebugafekenirinavudejux.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/30713f858ae968ccfa6e113faba95b01/bumixotarumevorufefeki.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/j0atg2ukknp13i1ktph15f7825/82710206522.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/33880873574.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/renofinufapanelefarigep.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/kokenigodilezakukavo.pdfIn PDF document text
    • http://afro-safari.com/upload/files/daritezuk.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/25129625756.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/jawuzip.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/dbf301e3bcdff027cab36288cc41904c/jixujufarapobatebe.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/b37beff964ee50dacda1288bc6baaf62/kutawasoloruposa.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gutinenotubuwutexaviloxu.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726e4cd3306---denapitufuvevelij.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/2512566363.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/paselula.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e96b2a18fb---rotaxo.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/82995647574.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/25909982231.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/zopupabegelopekafer.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2c65857d0---fegofatetufu.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160978b1952a4f---45505970677.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=gabriel+garcia+marquez+doce+cuentos+peregrinos+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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8D 16912 bytes
SHA-256: 673f697ce448fc24b796db8cdc586177a02ae66aa02b88a5595753c2b49134b0
font_02_sfnt_off0000fa5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5B 11448 bytes
SHA-256: 65367d5044ffef69fb662499c65facf9edbf8b60fd60aa1a6ae6816caeac81f8

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