Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54802df8b7e0d3c…

MALICIOUS

PDF

73.1 KB Created: 2021-09-11 14:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c2491fe08f2d5f2e819fd2529f6d1298 SHA-1: 4f09c8e5a35758f9d4c193dda08db889ee1522b3 SHA-256: b54802df8b7e0d3c24dc24b9e68153b6d58e386e20599a8889a2d4812732da68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is a common technique for executing malicious code within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/befokadovibadediwobik.pdf In PDF document text
    • https://lighthousemacau.com/html_upload/file/81117136379.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1927bc870---70134193832.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/99914599853.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/waxag.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/88688077132.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/26642305445.pdfIn PDF document text
    • https://aneri12.cz/res/file/sezuvad.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/c7a8998f8bf924542a68d7a9fbb87e68/46096505430.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/rawibosojefuronulotun.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613473392d92b---kujuzajivatomuvejirimaz.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/silijewupebawelitito.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/20949929913.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/guxorudaxugivukowinil.pdfIn PDF document text
    • https://yuktogel.com/contents/files/danosafobawugizivigugesis.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/42076632362.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/pebululomo.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/93070124156.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/32727387613.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/zitofa.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/048f72b16513bac51d103c62f2409bb6/rekukabilowap.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/56367746529.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/munesumuwesotunejiketon.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7427080b8---45708129847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=android+path+examplePDF 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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 10572 bytes
SHA-256: c6ed356da35519e4257494340d2628757ae5f43b346f812f36cbfe486f478216
font_02_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 17172 bytes
SHA-256: 75256ccb0003fbac6ee5223924a9a351b3a0ba59dea1fea6b85fe390aee05290