Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8a20689eb95879…

MALICIOUS

PDF

86.0 KB Created: 2021-06-25 17:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bfa0763cc13d5a222496396ce0b48405 SHA-1: 39cfdae73f0168211adae5713f43241aab4bca58 SHA-256: aa8a20689eb95879dfa07a2556b01cb8d636852c957118dc1876e4f458dcba00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment, where the PDF serves as a lure to external malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/mhkg4e6157vkgl8en6m08o00j3/fipedinamofixufojorofa.pdf
    • https://avela.md/userfiles/file/52602740101.pdf
    • http://eros-arena-reutlingen.de/eros/userfiles/file/55659712263.pdf
    • https://giverny-bkk.com/upload/files/zivebagutemewesex.pdf
    • https://tavio.ru/files/file/tinebepemejejebudinosijen.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078309551d78---22914821442.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16078166933409---sutuselupusabetob.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hs1k77g85k6emaiiajj3jqg9k1/regeremos.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e68a7e8a219fc5246e543b33d3f3d51a/33061570956.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/14954711977e798decc34910edfb70a8/xuwodupufofapif.pdf
    • http://seoulsquare.com/userfiles/file/3076967001.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d7a365305---lupixetifitevogotozo.pdf
    • http://airelimpio.mx/img/editor/file/42745595914.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f9eef09c---72204440958.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/2035dcf80c90169210d384e00c3769cf/pugupurubexudeli.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071824a58a51---vuxuwifefipatemurajaw.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9b0e35a7---subisazulifofopuvoseda.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+teach+a+dog+to+give+paw
    • 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_off0000f0c4.bin
74b9e6f9252610118cddac11daa839d044f7795e81f203d70564b96ca2fcb800
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 10516 bytes
font_01_sfnt_off000108ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 16792 bytes
font_02_sfnt_off000120bf.bin
5548c4ecebe728481653f2acd5cf66523dc5e3f74450a9c7f51b51faa1a8566c
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 16936 bytes