Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dfea002378a74a3…

MALICIOUS

PDF

86.7 KB Created: 2021-08-21 18:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 12383a295b7f6fc1a05bc5cff13fd3bb SHA-1: f38fe15e870591b0c342fc80c7f73d758bc3c965 SHA-256: 8dfea002378a74a317e97d6f19b59d03887e89246e2ab0dc240eb9db04b12d67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/421157142708f8fcd78fb7ea30f6fc46/4386979889.pdf In PDF document text
    • http://obrienbuilders.com/userfiles/file/zakirujasetoroxuwewosuto.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c864fb8575---44065372907.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/33830593524.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608196ceac3d1---rakepozepekufuje.pdfIn PDF document text
    • https://bursac.net/userfiles/file/numufemiririnoto.pdfIn PDF document text
    • http://beateromer.com/bilder/file/bepusedexevobivite.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zejisatekigeborisobo.pdfIn PDF document text
    • http://alkanboya.com/files/file///61656024389.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a5a8736eac548e2f067468d7e559bcb1/legagulubite.pdfIn PDF document text
    • http://hncastlecable.com/d/files/94129640873.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/51210145563.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/44354844b3b1ced569c29b73fbb0cb45/gesogewawufalowode.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/29186113681.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5323ec3412985520ca8d35871940281e/xokinawamedezujanef.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df1485126aa---55836951741.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/rufama.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/46210515943.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8c22a3a2---devedigopojapeputon.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/c11ecb2e6abd9975d35d447989208a36/15315645794.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/61f3d50e0c6b0cf02caa0839ae963819/11706069780.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/anag.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1b20d42d---rotopuvujavaxedaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=descargar+libro+tecnicas+de+investigacion+social+ezequiel+ander+egg+pdfPDF 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_off0000ee15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE15 11308 bytes
SHA-256: 37c9bbd45481cc945fcf3517160ad94ca81e5978eb6e30435b4c3185b5f27a0f
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 16968 bytes
SHA-256: 9724248f3bb072a604eda51dd20a6425bd16e0c020c03a687ce35155eec1275f
font_02_sfnt_off0001338e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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