Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ed2c81214861a1a…

MALICIOUS

PDF

99.4 KB Created: 2021-06-22 13:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 3bf64b4b12d7cecab2fbd77067e35c52 SHA-1: 72ba6ffd8bd0c059b34baef08989dee28dece4c8 SHA-256: 2ed2c81214861a1a4ec9239c8698823f5afe77a1cabdf44331e03e422c7c7cf2
104 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs, many hosted on compromised CMS upload directories, suggesting a link farm designed to obscure malicious content. The presence of a 'download' button lure further supports the intent to trick users into downloading files. While no scripts were directly extracted, the ML classifier strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6d4dd848c---gemuperegogoruretajuzowaj.pdf In PDF document text
    • http://adams-gold.ru/archive/image/file/71380838093.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/21012605318.pdfIn PDF document text
    • http://garderoba.sk/images/_file/39022306698.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/385617fc728fe71659e7d58cbf0f8200/90172117762.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210608135246.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/wewexogawat.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/59408994c3c5bc92ba2fe2f83d5ab26e/vefak.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/mqq21egbbskarmm9k3b3ldht67/9884916706.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0c763eb23a3959fce1abdb418dc040f4/vuvuwowojuporejerisa.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099938d62871---98983777463.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608665e2a502b---timuf.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3787655158.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d3efabaea485e76041611bac842701eb/84646294331.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/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+ultra+sun+download+ciaPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 5132 bytes
SHA-256: 874be44ac761b40783929b2592084251aa706ce4b4cfb708d2149b50f5a19257
font_01_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 5240 bytes
SHA-256: 93f0c2035f4f93a7150ef04409edcfe97dde1f7f77809af67921119076eec7c6
font_02_sfnt_off00014a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A7B 23400 bytes
SHA-256: baf47e0b45f582424a19ae2be514bbc5da20f37cc47616aa9b144f05776e5255