Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf9facf54ad641b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 00:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f4fadab27b5dbebafa1776bb0b37200 SHA-1: 413d5d7f7941fa4c91197cbe8033e6cda963eecc SHA-256: ecf9facf54ad641b43a9512f192e8d59fe02410de709c84dba05730989fa1487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the PDF structure suggest it is designed to redirect users to potentially malicious or phishing content, likely as part of a broader phishing campaign.

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 https://balustrady-metalik.pl/files/84097675087.pdf In PDF document text
    • https://nbtele.com/en/cache/fck_files/file/goxazelaloterulavakexodu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb64d427a5---94795552812.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607642069864e---7065309048.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/pulowolutivasoleza.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/badezopesotogof.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d07fa89c268---27538381473.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d9acfa08---27159070670.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f7d942690aad53b4bae0650b07b62fc3/6248049322.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/p8vrhmhlhdb1410g0dt6kc41g3/subotobakewemudasa.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/60cce0d8971761fd78b9448fb5377933/72797534388.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/l25e3bepocdlk9moj50io21u40/marijuda.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/lenumujifuminapitopowe.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/tedelufiwojinofanusevus.pdfIn PDF document text
    • http://juentai.com/userfiles/files/xojoweruriv.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/mixib.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/gowabiloxepekakojukak.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/54485821195.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/c4a91b5f7bf3d714be05e16dd60c568a/85571498429.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6a6ae586c9dc1f6dd4df12ae523baf8b/31799014574.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/wafivebegeroken.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3ajpdlloluvdub6fjbfmbidqt7/25146969482.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/65238323711.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/20ps19rgoh8hljad2qik3la1ac/zutoxopadunelu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=zk+software+attendance+management+manual+espa%C3%B1olPDF 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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 17660 bytes
SHA-256: 8c0082e1ad36bf5b4e3238b18a24ee05d13086c307ec893932853461266dbab4
font_01_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 11316 bytes
SHA-256: aa86440f31a47438ea2d6f598fdb6fc8bbb22ddf00398df38efe8718fab8804d

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