Malicious PDF — malware analysis report

Static analysis result for SHA-256 faf57e56e8399085…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 00:11:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b5822008ba2afa0401e03151c2d4164 SHA-1: 3a5a45095596725eedfd9aa71cc72dba6cac4cf7 SHA-256: faf57e56e8399085d60d4fb36ed32e1ec1e852433676b81c0ba35d5bd16ca65e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://crysiq.ru/uplcv?utm_term=asrb+net+previous+year+question+papers+pdf PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1611dafb8dd4ee---76394187464.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/84455123641.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29cd726a93---gafitevusokapemun.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/tapezosomajuroxunezutuf.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/pomuviku.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/mafebotunapela.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/texireduged.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/3270049575.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202163160103828.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36eeb16e75---wapole.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3db9b72bbe---julol.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/27050325097.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/20966615496.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/15137415856.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/27838320286.pdfIn PDF document text
    • http://davis-wilford.com/clients/5/5d/5d1655677b271656441dfc21bb295863/File/53071454559.pdfIn PDF document text
    • http://coffee33.ru/archive/file/buranowajorujaxiji.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/40708377583.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085273bbd4e5---wunekasakisatonexapajazel.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/83565654a3ccb5a7bd570f23fe022c3c/ponizozoze.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/xegiforonesogedojexiv.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/67323660552.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/67967475097.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c97ce0fc529ef73b0c3a8ec721dd1bcc/jixivafovejixigefodadi.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dbc55514---wezonuro.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb14a62980---33393169304.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/41447926099.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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 18756 bytes
SHA-256: 76e0937a5602d923c1939a61c27081ce88e361e14b071145078e5714b6e3000c
font_01_sfnt_off00011928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11928 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001313f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313F 10992 bytes
SHA-256: 3e3dbbdf7b6c23d11b66231f33f38963dbedf4d5a3edb55965e7040be1688465

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