Malicious PDF — malware analysis report

Static analysis result for SHA-256 e054c6be9b8408e8…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 20:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fd64d7d8b805e03f5c58448ee191c10c SHA-1: 265ed90964a00e3635af4d81c4ce49a56c62bf0c SHA-256: e054c6be9b8408e855493e8903bf4413724a708e3c8918b1016d6df503bac307
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these redirected links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://wawabed.pl/uploads/userfiles/file/16491663662.pdf In PDF document text
    • http://ck-kutnahora.cz/gais/image/file/fujadanapefor.pdfIn PDF document text
    • http://stefani.cz/fck/file/tobogonirajisotezal.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/55883427643.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/28abcb6dfe68778931314807157024a7/77232627191.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/40483042201.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/bazezufedobijigejikuf.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/gugamobakopuxajepeju.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/cde81f0dc4a45325e16d09bf8ee621a7/dedujumolijulawezazeb.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210908082120331675.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/lekosulodudidetenonirosog.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b0c862032238263f5a1ff049198c9c0c/purexasadoru.pdfIn PDF document text
    • http://wwstationery.com/files/file/4639575411.pdfIn PDF document text
    • https://tigaintan.com/contents/files/sibilufufasatesave.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/durelotoguluketisu.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/56979910896.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zorutinorozudodo.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/35222508572.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/siroz.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/5975261010.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/pobizibegigeribisogat.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/xadaroro.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/40861526904.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/18576741183.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/348998441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=desirulez+apk+moviesPDF 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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 17652 bytes
SHA-256: 143ff145d7be90ca955533173cb58e094db4ce0df3701e83222c46ac2aa7cabc
font_01_sfnt_off00010b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B40 10532 bytes
SHA-256: 57ad2cacc8efead6e99529df3c1bebf560ef89cbef61d0036b05c387f491a7fe
font_02_sfnt_off00012357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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