Malicious PDF — malware analysis report

Static analysis result for SHA-256 72fb438959e7fda9…

MALICIOUS

PDF

91.3 KB Created: 2021-09-07 16:11:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 274881c9b475d755d72e930361ee6f29 SHA-1: dc4d01e55f52d879c469149cd53904146e244c36 SHA-256: 72fb438959e7fda9ad8e844300e8cdfbe9dd419c029d6f22235b2297e0971b6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded JavaScript points towards an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://oniceh.ru/uplcv?utm_term=advanced+photovoltaic+system+design+pdf PDF link annotation
    • http://atthaya.com/file_media/file_image/file/73582402623.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/ropazinowiruroju.pdfIn PDF document text
    • http://fxmeat.com/upload/file/7d5dd6e368d846b6bce3711f65d7e76d.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/54ba38ed17b201f85339e7e137cc6268/10907088164.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/73601181379.pdfIn PDF document text
    • http://www.ddu-hk.cz/ckfinder/userfiles/files/kizugewis.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c72512d162---70806112649.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/93561239148.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mr8j24c30hv318f1s1as6ig236/puzilajosat.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/89146288324.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210829220255.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/17816857160.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/7950781382.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/73591376253.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/fanidepopenuduwobilojomuf.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a4cbf3817---80376934296.pdfIn PDF document text
    • https://rinducm1.com/contents//files/60431991974.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210822_072BC1428888DAFE.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/zokofitasuwaxewopa.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/vevurelajezir.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/mejizejexekujozow.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/70471530929.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/kotofuwodapivetakarob.pdfIn PDF document text
    • http://toicodonlyson.com/uploads/files/vodulapelal.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 11128 bytes
SHA-256: cc52f48316619503f29a209d6f0af799f6b0ffa7ac48f8623ff56d9c4d923b8b
font_02_sfnt_off00012c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C82 19660 bytes
SHA-256: 65a26d27c108de98a3f2ef0187b3c5d01efca0d1392100c5a7a2b85b67c05f6f

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