Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de0f19758b91720…

MALICIOUS

PDF

90.8 KB Created: 2021-07-03 10:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b83cdd321558b39d405899dabd3d5774 SHA-1: 7bec4bf45c30ef8089a5097ae88db66b1c1b94e5 SHA-256: 6de0f19758b9172089801ab964ce2e486490506784f234a7bdc41a67cf8a1912
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous links suggests an attempt to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cdwy028.com/uploadfile/file/20210531113010.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c067f4c7c69e539dee4389d0a25a5681/xuwijox.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2u24i1rcc8m0kinnb28utfjjab/76081316429.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/862f557476dfa56768b7541c1b34d566/77802409820.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d3b14b407050b3a82ceef29a30e37f5e/zorubozo.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c8f37767---zigoxojolav.pdf
    • http://slippersymposium.com/clients/875641/File/73156347540.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/0hvple3sut4mdlcm8qn0bffnj5/bemoxutu.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61140b30e---fenoxepeg.pdf
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/iqrj56pofpju804uiqo7cu6vf6/rewilabarogusebe.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452eae2014---51753461505.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/317ec9dcc1479c7eef4204d96d1987a7/sagapefegux.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/005b701779bcab3bf6741b660550f9a0/rerinifumekisobu.pdf
    • https://musikkursus.dk/userfiles/file/10091885623.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0e7d8b11e---67873760017.pdf
    • http://davidlbrooks.com/clients/868292/File/26645748219.pdf
    • https://augsburger-dartliga.de/uploads/file/70010294032.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609438c5cd69a---zefebegixipekuwidekapavo.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a0c9953ba---39286708696.pdf
    • http://firmykominkowe.pl/Obrazki/edytor/file/bagisopepuvigevakome.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7c468e693---11468731973.pdf
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160bec5ca7b255---budakobubib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=college+is+the+biggest+waste+of+time
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffe5.bin
8984f7b85971c8d153dbd3b73f3c307a8dcd5b8d3251c67dd5de91d793a9d7f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 17336 bytes
font_01_sfnt_off00012d28.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 16792 bytes
font_02_sfnt_off0001453f.bin
ea3d9fd5a5e73405ca2756dc671d42b4c8349c94ea4924c6d9d693b38213d5bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1453F 10716 bytes