Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0889171fbb0ea3…

MALICIOUS

PDF

87.0 KB Created: 2021-06-12 06:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e7a2aff519a9ecee1f7c54dd0a49c6eb SHA-1: f35ea237237691618afb724ac79daedb4cf36f0e SHA-256: dc0889171fbb0ea3375d2493eee6f2a14e1ba0b76f467807a49bd7063943dd15
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 0.9997

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://allytemp.ru/uplcv?utm_term=draw+a+typical+plant+and+animal+cell PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace624a5f9b---memosisalutirojasupulivu.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/babiletowige.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095ffcddc7c0---jasez.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/14900784166.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/31681527345.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/3767e62e8421e165a5ab95d794aae5d3/rafanifulezakajirezufa.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/89354647054.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072de0946691---bipaxikafomagozopuwikasus.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16089e91c408e4---nudilosa.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/3aa494c46c934020d8c872aa815e7587/giwusugunabizekofegi.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/169972424160924b0f5cc81.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ac7ne6b8hf7m26vf29lmpc5pkk/38260872787.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • 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_off0001014e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014E 5232 bytes
SHA-256: 542fed1034fc514d639d0ebc54205c652bd966c9dcfb7533ea8ab36f025c6408
font_01_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 11220 bytes
SHA-256: 6d8dd13597ac069c62fbfd28a3be1218c07d8a70c6cf10152a14f8bbb7608ba5
font_02_sfnt_off00013961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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