Malicious PDF — malware analysis report

Static analysis result for SHA-256 a297928b3480313c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-04 08:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5e5c68628703cd4376f59bdb552c5911 SHA-1: 9e905cb73d32f33b46d4c4c6e2d6b71704873f3f SHA-256: a297928b3480313c2458e019082a68493604a863079181f8a6bd1802f1a9c565
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that employs a social engineering lure to trick users into installing a browser extension or update. This is indicated by the 'SE_BROWSER_INSTALL_LURE' heuristic. The document also contains numerous links to potentially compromised websites, suggesting it may be part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the nature of the lure implies potential for further malicious activity, such as JavaScript execution or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/632c9a54dcf10258f1046016c0ce52f3/xuresugilabiter.pdf In PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/96eb2f579752d1946aa91d83569cc0f3/tedeluzevapikixeg.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4577c23994---82066707126.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/sekukugubaxe.pdfIn PDF document text
    • https://cmoretv.com/userfiles/xisilobafetakuxatisode.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/venabivalolajaj.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/jibivadifemokozonamoboxat.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/43022944505.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079e2026019d---81645801898.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fe0ef972567---fesefivinag.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee46023033---80379222475.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609847899bd89---xotorazaxisidi.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/91616269891.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/jasebowixupin.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/25926854199.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/dibuv.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/vafomumaxafawumu.pdfIn PDF document text
    • https://x-software.cz/data/file/kasuwimamokavemaviwipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=change+pdf+to+image+jpgPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/23902029917.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_off0000b96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB96F 10792 bytes
SHA-256: cb5ee67d54ca9cecda5227eae4934b05b77663d3b05b0dcdf675d35d1d996337
font_01_sfnt_off0000d1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1DE 16268 bytes
SHA-256: 89b832b1c2a2341464a7bbbb2510c7524a069fa9917aac2b80f4bc2ba16a4c9c
font_02_sfnt_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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