Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2a298a75fa52144…

MALICIOUS

PDF

87.0 KB Created: 2021-07-03 04:19:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3dfea2e8991a004269e9b8471dc89900 SHA-1: 88096f1739aa828bb0013f12e0fbb44d31d837af SHA-256: a2a298a75fa521445791a5a069f1c3f8a5960500b3d78e6be4d8da2cab0a48ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the PDF_JS heuristic and the presence of many external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=difference+between+well+graded+and+poorly+graded+soil PDF link annotation
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a945d6d82fe---beronil.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/33187332688.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4486451a44---sapabezivaxoj.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b585b78e859---webox.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608239f862172---balupof.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/2306688736.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/45186520193.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e00baecb4---89462286578.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/05cb05fd7370738e6e27b5327132fdd5/67810127939.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/2772272283.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/9a215e22d5303e28467b9449d22ba04e/nurexazejogi.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/47530cf9dade8baa1330917179f7bedd/gabiludezudujuga.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ba05a40fb520031205732ca1efc990fa/xotadexofuzapixupi.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/s6888i8k74cpdi3ronbqbse6su/38050855861.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8812edfaf7---xemutoxinidazudegujenimub.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/bemiwela.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/muvapopekamotexakelalu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/d5c3ff36bbf38999df28266442576d6e/42221304482.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/kaludufudifisuguxaw.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e3171eed8---42227966196.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d90d9d2b1e4---xozonudola.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082e793abccb---pekejojago.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/44440230435.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/mimabawenilipujuko.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/muxezotojirebagu.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b89206bb6a4d4564bfe14bbafe0b19b6/zunezonekogilalugogifoto.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_off0000ebc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC7 17548 bytes
SHA-256: 05f08d3fa24a93a3ffadf31b14750e652922867df7506c46c16738d607b6066c
font_01_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001325f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1325F 11136 bytes
SHA-256: b2a56654bf644eb6ce5aaf4a367f1ee2d04c5924e3d566afc7a725bdd352f014

Open this report in the interactive analyzer, or submit your own file for analysis.