Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3228a2191ecbf7…

MALICIOUS

PDF

78.1 KB Created: 2021-06-11 10:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 2c44503f0a125054bc45c5fe782ec367 SHA-1: 0132a65f4e3a0da1b8a38b9a468c4faab790c177 SHA-256: 3e3228a2191ecbf7ce2a6e0b86587ee85d5170ca10154a1fe87dee1df2a1cd54
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=unlimited+traffic+rider PDF link annotation
    • http://photo-preiss.com/upload_files/files/11007568907.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/54aae22e6d079d3afe5f5bc5a25182d2/87320898407.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096901d02421---logum.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/020148214381.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/firaxoku.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3fc4563eca9dc8f45575c5613036656e/gakisebin.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07d68a219f---22262764586.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/30522528915.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/bf352911915504eab3eb6371e1ec0deb/bumoxaponetopunowidetatev.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea75b9c7df---26779466697.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c94548560e---93448530811.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/widitifo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a892a1d84c6---xuxenule.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/a6d07c822d541aaf74f8ab4623059236/52024910852.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 4660 bytes
SHA-256: 4158449cd4a0ee96f2ad594f6b58476a064536a9c4df1e930fc8560d61ecfdf6
font_01_sfnt_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 11184 bytes
SHA-256: 26f3524e3e0d80297c47993e96e32d52a4b5bac484283e2edacad017510690d8
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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