Malicious PDF — malware analysis report

Static analysis result for SHA-256 a652e0a8aba069ca…

MALICIOUS

PDF

93.9 KB Created: 2021-07-02 12:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 925e77742bcfa5e1a38d7b1b611f57c3 SHA-1: 0bf8386c214b4f7ff0805199ab8d19e3b2d9ae00 SHA-256: a652e0a8aba069ca13c9cc63ee0366a793a71c375e7ad01fba68bdbd001a2400
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. No scripts were extracted, but the presence of numerous external links points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/p48qbn1pbjnnssftjv9soo43tv/46093866511.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3d935b2c0c5850d2f62fc15d775564ee/saguvenanetowedevarob.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/ba3aea94edab9feb579a5ba8a5036c3a/zafogakejibamolawazove.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608e475fe8d8e---mufiwunetorova.pdf
    • https://presentkompaniet.com/img/content/file/diwamoludamizerisivad.pdf
    • http://z500.si/files/36664485858.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e0dcrf7ub65jbkuhn21f5jq4k4/23639846010.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3a1ea77bb2170db94dc0b7b3126382b8/8489583128.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87b32cb603---30081617489.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/skd26mgphtgfkt4p5g8t6apbjr/pimikeveluvitin.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b46077d70a---94429560385.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/b1450bd0968b46130adf9a2c63df4543/soxuromuda.pdf
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2585788f0acfbb2357d0b0efafe3b87d/kibekijututego.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/8985c3ae0696b50dd6d6bf369fe61816/45515135223.pdf
    • http://bioscipublisher.com/files/upfiles/file/37089258013.pdf
    • http://pusancard.com/userData/board/file/wigow.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/ihaufc2ji3qq7hhhsuejnhcso7/vuxupefefitu.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2d9bda813ec1bc8261b8ae90426e70a8/lawuxedexitogezamokifo.pdf
    • http://strategie-online.net/catalogue_dynamique/file/52145526724.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc101ee604---ketevavufafivunubavume.pdf
    • http://www.peretprod.ro/content-images/file/86204947014.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf08228cd13---rofibamix.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/cb980c2281d02f88ca7dfa7444c2c87a/domur.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9cj1el2uolr8bpvk6qdh3jl0e7/gofevividarojufonuvev.pdf
    • https://murten-hotels.ch/userfiles/files/fapodepele.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=workout+for+50+year+old+man
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f169.bin
c6372aa2715c79e85e2b027ecd26b5ea7c272eb8a2acd0bd72d051f2f3f03708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 17692 bytes
font_01_sfnt_off00010c5d.bin
4701b67156c16816b3700a8c17149636ce8a58b6f75e6d973ee018b10882ab7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5D 16980 bytes
font_02_sfnt_off000138b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138B0 16792 bytes
font_03_sfnt_off000150c7.bin
7f192eda10f76183a04799762683b30ae2dec21f0d931bf8a37d6065cf111fc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150C7 10812 bytes

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