Malicious PDF — malware analysis report

Static analysis result for SHA-256 478923fb44030b10…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 04:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fea6267bf431602e918a20eaaca66d12 SHA-1: 8770e2940fc25de08557b3187d438fda86cbbab9 SHA-256: 478923fb44030b10e1fd092035f1fa539003d8d543f2118732a353ee6cf4cc37
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple domains, including compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious or phishing websites, as indicated by the numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=malaysia+to+amnesia+full+movie PDF link annotation
    • https://tomorrowhubs.com/upload/users/files/51647905492.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e3aaf702c04a3723b82532a122ebd1a1/54905799442.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/42304430522.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/nejagasiwosibivudu.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/zanodatewexebufij.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/folalobuwozonamusi.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613761d73efde---mewew.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/95213863818.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/lixajirusawabijidetijuwa.pdfIn PDF document text
    • https://85097781.com/upload/files/rojuletuzaxetosafoz.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614836cbc8009---64433978996.pdfIn PDF document text
    • http://www.travelwithtaangoo.com/img/file/majarunoruxiremefemi.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/84836995622.pdfIn PDF document text
    • https://ebooksweb.net/files/file/wolisinafulisojiretarofis.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/bilujofurovewutuka.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9a7bc2c52---wufitelude.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161533ff119f7a---86681592991.pdfIn PDF document text
    • http://hingliltd.com/userfiles/bipobima.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/xukugoj.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/33505013911.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/99557773887.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zinopidutadebuzij.pdfIn PDF document text
    • http://ge-mak.com/files/sumatakotibobebuvorodar.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/pofazorexanatubevidafev.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/53677438713.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_off0000b19b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19B 10548 bytes
SHA-256: e610b746b0465087a0073b89ee5f122cf9eef4ef037348afd919c85ddb991a71
font_01_sfnt_off0000c9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B4 17004 bytes
SHA-256: ed410ecf052d9d93c4f4cc11c9f7cf38dec9f6cc6540d06a41f7b5baf2110ba7
font_02_sfnt_off0000f51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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