Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9450730fe8192c…

MALICIOUS

PDF

78.3 KB Created: 2021-08-22 01:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e51c4990b9235588a15766cce458b4a0 SHA-1: 4d3ecee919b5dbfe57700d019e8dbc7402c87adf SHA-256: 5f9450730fe8192c366a7b4b3489450d47f9f57671c188cca21533479a657b8c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a likely attempt to redirect users to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirection or download attempt. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/jrs1aor1t5eonp9f14ngd3a8ob/52593242653.pdf In PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/44210954784.pdfIn PDF document text
    • http://home-plast.ru/foto/files/pemidegatolusumuwemerope.pdfIn PDF document text
    • https://argumentua.com/i/file/poradanupekiguv.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/65257800018.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/542bb4827b7ddea11ec90c669c72e619/nitalezevubejoxejali.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/c5aa925312c5869ca6490b3d10ac3e7e/wuzegimutopodux.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/jitumadewo.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210816_FC380F34299861CE.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/def0f1f84470c62178b0501484029f6b/17019957902.pdfIn PDF document text
    • https://matfreklam.com/calisma2/files/uploads/32195706480.pdfIn PDF document text
    • http://terminal.hr/userfiles/file/57053823129.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/84065633710.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/dc9a3e29325dc080a29e540fbdb6fd8c/todabo.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/nhut5rvjr1fdddkrl20e2186p6/sikuvorovopalatimoxe.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/p0600ispjfoo4iovst2b6rd9m4/90184724452.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bddb9f067---97250366474.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6998e334c3---15705693125.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeeb35ff16---59669839609.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/bejebok.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/3b79a2a93d53587855f68c931935adc2/97661040050.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/noriludigafaba.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/zelufewagifopobamagokofup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ferdi+tayfur+filmi+izlePDF 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://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_off0000ccfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFA 18352 bytes
SHA-256: f54d611b894446a96828310c0471b6eba5f609724b870a2ff8a211bb833016eb
font_01_sfnt_off0000f925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF925 10372 bytes
SHA-256: 362080bfdfd7cbef0b3e65ccb540fb1671d256d572e6b3e459f3dcb6b71be41a
font_02_sfnt_off000110a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1