Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c74a78d415498f2…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 00:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd78e884a02a8d132080c76b7cfbe502 SHA-1: 89ef7c634a287d92a4d9628786df6c602ba9080c SHA-256: 5c74a78d415498f2cd5b5ad8d263123bc6e8d5ac48d679b31a02eda86f160ab1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, primarily through its extensive use of link farms pointing to compromised WordPress sites and other disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external URLs suggests the document is designed to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/qevepnfjpmk59clqt4fj8tnd26/31553810239.pdf
    • http://yangpupark.com/uploadfile/files/93483998789.pdf
    • http://www.blueoak.fr/image/file/degukugotulutokirabole.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a918c3d8---48563943630.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e22298c618d---50633144437.pdf
    • http://mcutech.net/files/rewubejerap.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nem5h0c6n8l7o9cuo5m7k8d2aq/37289249902.pdf
    • http://hermangroupcorp.com/clients/3/38/389628ddbd62db2fa1e4299ecdfc1861/File/66535450576.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/e09mgn4sm9u60dbnnhftcp5q4h/88517337358.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4879fd34623ebfe54536fd0c631bc941/nolebel.pdf
    • http://ldbell1965.net/clients/85689/File/pogokixiderebezibovaguk.pdf
    • https://rybczewice.pl/userfiles/file/23562877938.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/kj60kufclvja44si0nop2dvcpo/nolakovebew.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/be648ebc7b26f188e29e837eb5d46a78/59691935412.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32cf8de478---32248289121.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911de5a890a---71297832688.pdf
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/bepotimotujitagut.pdf
    • https://nilsahost.com/calisma2/files/uploads/bubewafegoviwobusolumo.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8fec4c79a3---40069949058.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0d0719d9---numefejukipiwape.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/03d0031b321f4e447ebb6e1f64aeee28/bimusipowik.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hns9u2phmn4nte39iqth479210/17069805295.pdf
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/fdc373c49d1da2ce10d2c3dfdcbb59fe/49945831616.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff964c400---38919808135.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5553cd9b561f066bf2371208903805d3/5686084186.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/4351647591.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=star+chart+app+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c1.bin
00ffb939eef4b0e8ef5c0662032b24f3ec3072cc50b3893ab5470fc8fbbfcd19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 17820 bytes
font_01_sfnt_off00011f26.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 16792 bytes
font_02_sfnt_off0001373d.bin
83cde2917da1c4d7743c5072e8352aa26d3e2bca74f16e8601decc09149f419f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1373D 10340 bytes

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