Malicious PDF — malware analysis report

Static analysis result for SHA-256 a129e52d0d03c21f…

MALICIOUS

PDF

114.4 KB Created: 2021-07-21 12:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6596b159ca30adefd57af1c7e3757b68 SHA-1: 990c6f2a4d129c6d13af64c02b92f409b78f1499 SHA-256: a129e52d0d03c21f74a9aa170829fbd964e9d980c692508f58e47d429db0da31
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination and evade detection. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/70a8ebe84682394dd48df0e0b395c3db/peropalotedofavuzakutani.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/fepusevepodibuzurixi.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/46041367244.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/boned.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/13527689844.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/zegukanuvinivosakataj.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3f1f30ba9c2a55a4c20e2514623c9e77/59195586834.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ed60a3572212abd5556854221460871c/wipamoramu.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/80087961748.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f02dee456de---dadumiwu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/4fa646e44bf35aa8b614ac786f1f4e75/ledunukixijegopepamadajud.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb5daeb24---teterasosuvubatupajoz.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/zaxon.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad89a51b258---vufuzabivipexegozokuz.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/fizulirosabutize.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/3db91db84e385e964056363f463b2b52/72014675403.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/rivazakapaziwerezukoka.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cf091f6e1---gegukakedupegasum.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/xerupoge.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e61b0259bb---66585232161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=123+movies+harry+potter+and+the+goblet+of+firePDF 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_off00015a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A51 18244 bytes
SHA-256: dd26b42e8114e05c3326e5ea0faf700cd10df7c8217e0bf7de2f791635560871
font_01_sfnt_off000189c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189C2 11512 bytes
SHA-256: 0c3acf1f5c9e24814689b141da6f8c789f05cde840d3d57e2dc1768bb84223a5
font_02_sfnt_off0001a47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A47D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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