Malicious PDF — malware analysis report

Static analysis result for SHA-256 daaac010c2a4b8f0…

MALICIOUS

PDF

75.1 KB Created: 2021-07-30 15:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8aecc700127ea864b367143f43a78725 SHA-1: 82a5d7e0ba462dc60ac5d3ef96d1fdee011e85f5 SHA-256: daaac010c2a4b8f04dfb3ec5886754febd5d6de68223a678dc2f1e1423c1926e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://nail-free.com/ckfinder/userfiles/files/sejagorubazufove.pdf In PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceea2efc3---nazul.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nuxurenutawegepikek.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/mexexuwakonironi.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/lexazobututaperalemerise.pdfIn PDF document text
    • http://phillipsbrothersmill.com/clients/6/65/65192871cce8a6e36080a9ebd2808b02/File/91711720916.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/50797063053.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/932214479.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/3554734ce893c8de838353452be4badd/satuwanosoxodoxebisezomod.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/26388923088.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50a466ae2---rumagipo.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/movafuzufegatukakazeravel.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/30928022518.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/9001536214.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/daaae259a75e5e10773f4b28587fbd7a/xuwonedinijisibonuvi.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/tunirigozafijigulilu.pdfIn PDF document text
    • https://activepymes.com/pub/file/58580395743.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080287a28248---texuvivu.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/kezetogus.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fd86323b68d---perolatepamifobuwatilotes.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c5245290dc7---mepidafiguzeredesiwivador.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614c358dc0---26456626599.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8faae6ddce---99204322581.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/92425897150.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/617357156267607413f46a6a9d0ef218/26717172680.pdfIn PDF document text
    • http://lalinpress.es/ckfinder/userfiles/files/73561994853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=black%2Bdecker+20v+max+string+trimmer%2Fedger+lste523+partsPDF 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_off0000be4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE4B 16264 bytes
SHA-256: b10e804202f1844b934a95e2bac5662c3dbcc4bdef3c6d33b4df98a4e9579171
font_01_sfnt_off0000e8a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A6 11632 bytes
SHA-256: 7290114cdba593e76ef351a52b117f72d7dd50d906abbdd797ee4ede57c58ba3
font_02_sfnt_off00010450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10450 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1