Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d099146f2d6e7f…

MALICIOUS

PDF

82.5 KB Created: 2021-06-23 00:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: e4cc9a94eb1b9918cb3500762b12f968 SHA-1: 592501381de4aaece0b4cae1191293ddd1ebfbe1 SHA-256: a2d099146f2d6e7f73744eb169917603083b23568a3491795cadfe72293dee47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs embedded within its structure. The ML classifier and ClamAV also strongly indicated maliciousness, specifically classifying it as phishing or a trojan. While no scripts were directly extracted, the PDF structure itself is designed to redirect users to potentially compromised or malicious websites, likely for phishing or SEO spam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://aduanaldelvalle.com/userfiles/file/matevezepebotubajo.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/907e8c9afad5a32d448da14c9943870a/jovitodunibeloje.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3507148a2aadb3c03fb9f252097f6f8b/31244364858.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/tovirazotowazadomulalu.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/54915386818.pdfIn PDF document text
    • http://ashioke.com/images/library/File/topenapinojeguteduwof.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/addc69676d57a590bd3f318bc45f366d/6410178283.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4d749aef206aea18fc7db7f120e32a04/vitutoxupiwixewiluwo.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/vuwigojirawize.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be25a6dac84---27631486478.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3fa2578f---xoxasudizenorari.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092106707781---fixuwujefasezixugeker.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ebdf3169---9447064449.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e38b9b2ec1---86035298547.pdfIn PDF document text
    • http://rld-carbon.ru/file/sawojaripiserewaxopo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=pokemon+go+spoofing+android+9+2020PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE1 3640 bytes
SHA-256: e781c4610920db3461d3f2d657d16c1cc0d381f2e497ff7c20e0d14be72bedaf
font_01_sfnt_off0000eadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 5824 bytes
SHA-256: ab88eedb0eac3b7926e34ad00ca4b3f1df9075afe7ddf29ba7f85526a6d5c6df
font_02_sfnt_off0000fea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA2 11172 bytes
SHA-256: d473a227ede2bad0bd551a5716319e5216282d1a32232b096fb7d14462d93f01
font_03_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 16440 bytes
SHA-256: 3faff99f8a1160bdba73f00236fbb8aa90801581dc4036367ff4002d36d23ee0

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