Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb20bc8cea1875d…

MALICIOUS

PDF

88.6 KB Created: 2021-09-19 13:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef03e33278da26156336569edab164b7 SHA-1: cbe6dad64f01d0743c7f753835366c565fa28c83 SHA-256: ceb20bc8cea1875d16561726dc21499ed6a25a26466adc65e610fada15ebc494
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. The embedded URLs, while numerous, do not directly indicate a specific malware family but suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://szkolka-wiercioch.pl/files/file/xirelegomunegede.pdf In PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/2226962065.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/pomafubopiw.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b11df38df---kokoza.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/91419030378.pdfIn PDF document text
    • http://iltorg.ru/upload/file/jusosisesifikela.pdfIn PDF document text
    • http://pasaru.com/upload/files/24467998405.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/97308137661.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/97134160655.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141af9c0b23e---xifefesolanesukuxo.pdfIn PDF document text
    • http://alpes-de-haute-provence.proximeo.com/ckfinder/userfiles/files/46824174632.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210905205315.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/setavilitekitopena.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e3800aff1---38197509875.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/sobozefalosepepedasut.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/20125905146.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/24871331171.pdfIn PDF document text
    • https://energooptima.hu/upload/File/lepavivonetesubejalivel.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/25878402431.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/84152023282.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/bomukazosemifumogiduji.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/zasitalexagemiforufo.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/66591541639.pdfIn PDF document text
    • http://playonathletics.com/userfiles/file/wewutaxiduwini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=pokemon+go+apk+iosPDF 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_off0000f2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C9 19184 bytes
SHA-256: 3808d2dfd9d1b64a6c1fd1b6e8454334fe953fd677237b039d016f68a32dc83c
font_01_sfnt_off0001251d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251D 10444 bytes
SHA-256: c4c3e092ca187c9fe66fffe11a33c1e12a75bb16b52826f2beb7c6d00e779f4c
font_02_sfnt_off00013cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1