Malicious PDF — malware analysis report

Static analysis result for SHA-256 27082988fee6d3f7…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 23:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 05348792975e6c4ecf613410e43ba571 SHA-1: 066e1fee6428b036c0cccef91d315de306a13c1c SHA-256: 27082988fee6d3f7c2564776bdf64595d6294736e77f1f4b2de2f20eac101d07
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous links to compromised WordPress sites, which in turn host other PDF files. This structure suggests a link farm designed to distribute malicious content or phish users. The ML classifier strongly indicated maliciousness, and the presence of multiple compromised CMS upload links reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://medvor.ru/uplcv?utm_term=past+simple+and+past+continuous+lesson+plan PDF link annotation
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55fd62b88---90822629983.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe3655e107---sejajusawibopeve.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8565179c3dc2f978f0e7c1dbf3985219/23925313231.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bc8669f239385ecd0dbc418eb7e6a153/28148015416.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/viveguxol.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090300b90487---foziwuditakupesawovu.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/jodobidipetawemamak.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/9f53c5c579f3c92ebf4419d8f7ac922d/xotibosabigediwivak.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/2li0bqr1g8pin65gfapl59kqak/dudewabobabelor.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/n5pitjlh1aleqfo1dqmgl3dmvp/tiridasokipadunidugodiku.pdfIn PDF document text
    • https://pestresolution.pt/site/upload/file/68492358673.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a222050e6d---vomagirixonagepotoxi.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/aea69d09f28a752034fdc9a182aa3f0a/24644626921.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/3952158550.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fe43de75158f8c37f30700c9b3e24f0f/tovukinulafibutozasufilu.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/gatodewowib.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a6689ae5---sulugitolisokekifoviraso.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/npq37f3qmbae57mo8mi53190t6/62035021914.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/67493674820.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/34fbf9e801387949f83580e23f5b59be/16173107677.pdfIn 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://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_off0000e902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE902 16960 bytes
SHA-256: a5c20a50fa726633bccb3e8a595cffc976fa528950cdf99ab3de4dbd6825fb1c
font_01_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D86 10676 bytes
SHA-256: 9385ab64ababe704024568ffedf642f6ff7bf73f736ce0854d23f1fbb819ce16

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