Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef31b2983d77da41…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 03:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 692fe04c24d4a6231905f73c2c28278d SHA-1: 75f0bc4472e5c04701439825648204508c534bee SHA-256: ef31b2983d77da411a946dcb3a579835f2346bed02bd6d6274b33d6ff25ba616
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://jerseyshorepirates.com/userfiles/files/43580502920.pdf In PDF document text
    • http://ternovykh.ru/content/file/xijorasulekuvizosakipemo.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/sepumodagobekesezefibisu.pdfIn PDF document text
    • http://landpas.pl/upload/file/natimapijegiwem.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321a4ad391e---lunarebasabe.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/55604976843.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/57486686236.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/35035104497.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614549a4f3359---titileloxavik.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/81574140152.pdfIn PDF document text
    • https://agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/mimikure.pdfIn PDF document text
    • http://baoveantam.org/upload/files/50008589480.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/4455101562.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/mezusolovasaru.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/16526842002.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/70437522967.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe205f3f95---zopevajazopekaket.pdfIn PDF document text
    • http://cga82.com/admin/File/85116734139.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/telozuzen.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/litivezanamon.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/85217305815.pdfIn PDF document text
    • http://kocgrafikavukatwebsitesi.demowebsiteleri.com/upload/files/98101532494.pdfIn PDF document text
    • http://yjccnc.com/upload/files/tokukomamod.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/15057576586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=slacker+radio+apkPDF 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_off0000cf37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF37 22112 bytes
SHA-256: f38af2e4c1c01daa38bb6218df9b14885eddefa4a1039d0cda2b294321743753
font_01_sfnt_off000109ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EE 10304 bytes
SHA-256: f5c7dc7db201ee10e65f1b7ae88c504cc18f2338b99f437efecb1e525372a9ca
font_02_sfnt_off00012134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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