Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd81c3563c3602e…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 05:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4de31a8e4bcdd33bc248499cac0dde38 SHA-1: a5c6e92d0bdfcc21414e645869741a6b9409ab03 SHA-256: 3fd81c3563c3602ee81e164ef20443677b6f3830bc1ea1084ee7885973a953e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely attempts to download and execute a second-stage payload from one of these URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916fc348bb6---lufunorojavoripixupezuxid.pdf In PDF document text
    • http://vipnjl.com/userfiles/files/bowojatotu.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/aee561fb4aad37e9ca614d9c76aea45a/jofobiluxuzusegunalokik.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/bitodukekipor.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/fidaberanetugam.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/mikipul.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/gelijobi.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2r3ldntcn39apa6dvle08nsf78/kageteloxaf.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/wekoxemunavopabonulanemu.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f4f4797a0---67721784344.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9e2a269f7---xeramerolanibelusaziwuz.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/duwudinupukewilebepeden.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608331f6c78ef---fasugoxetomezavoxipunu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be84b071614---nuvitizufunovajaxupo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d068113dc5---foratikokepiteridusixuw.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/dfa9f17a5975517b0189789cfd09559c/73818142704.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/92f9ae09aab29f632ce64e81e3d94609/wewojijin.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/86427993676.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/bunefanoxekesul.pdfIn PDF document text
    • https://info-jimukyoku.jp/lot/upload/files/tusotemib.pdfIn PDF document text
    • https://ka-base.no/images_content/file/lowavunavutizugej.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083b5b19dd51---kajugobofijoruzagetatuze.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a89ac9f16ac47928d7bb59e3a5ce1733/53351076426.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/10341238509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=eggnog+recipe+without+raw+eggsPDF 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_off0000f12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12C 18036 bytes
SHA-256: 99b38cdfc4f30e94806f7774600561d7bb41235b2f7f977ed5f2063401a08175
font_01_sfnt_off00011ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFD 10776 bytes
SHA-256: fa0bef7b3077b8901351bfb343938e419c55209a2fcf0736daee2d215028a0e0
font_02_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1