Malicious PDF — malware analysis report

Static analysis result for SHA-256 628a867a1320c5bc…

MALICIOUS

PDF

71.6 KB Created: 2021-09-12 14:53:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ccba83a7e04953b8457c3c822ff60549 SHA-1: d140fa6390c481c6d6bc39504ba49ea99c8a2f18 SHA-256: 628a867a1320c5bcab131b6db646f7a778a32f7950324c191083c6bb2d02b710
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm aims to obscure the ultimate destination and increase the chances of a successful phishing or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=aha+games+apk+free+download+for+pc PDF link annotation
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/vasodoxegilufis.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613579a2a9387---vekinotusefilamepapabugu.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/78237876269.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/47010222950.pdfIn PDF document text
    • http://baoveantam.info/upload/files/daziwojobezuj.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/89017565826.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/a0faa72058fab70965297ae70bffb967/72938395105.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/35684271767.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jubofawulorub.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/96570792204.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f2f8110766dba0a024c0c9e169bc9222/86620203601.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/bofavo.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210905170838_7f3fw9.pdfIn PDF document text
    • http://geose.ru/userfiles/file/88657700638.pdfIn PDF document text
    • http://melabo.com/upload/files/2740703827.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/54733508337.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/90566754042.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/runanatisosijuvu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2bc315cfdc27187565702853009d350f/doxobafukemedanozoderi.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/mikoxaxevisuzot.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/koxid.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/02/dadexokelijesoluluxo.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/45909264854.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_off0000b608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB608 11036 bytes
SHA-256: 4fc5c26c2ff7377e1b60e54850cdc6f48778f563a0570b53ca509f1edea03a1e
font_01_sfnt_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 16304 bytes
SHA-256: e9613e41d238246ad5300813f7557c09098eeb8f4b02127f9697c093048d5044

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