Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88f659fc2d8db97…

MALICIOUS

PDF

78.6 KB Created: 2021-09-01 09:34:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 507d068876e0f05995aee31991b48566 SHA-1: c3d71ab8bc73a864398a9bb712f87f19043aebc3 SHA-256: a88f659fc2d8db97f6e231f725d501532e4f8193c855f93fd4bcf7174c9741bb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised or disposable hosting sites, which is a common tactic for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics strongly suggests this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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 http://fsgpj.com/upfolder/e/files/20210814070725.pdf In PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/66ce5d0af1e6d6bca187b01e49b83c49/27448328776.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/guligefujazowifuvevuvifu.pdfIn PDF document text
    • http://lulanjina.net/upload/files/fosonil.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/fifozo.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785d6ee7b18---lolasoxoxuzenole.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/2486889891.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/85434390029.pdfIn PDF document text
    • https://rafautama.com/uploads/file/15243187809.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/perizajames.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9af13665e2dd9f4f877b876663e8ade6/25654754244.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/toxupegezagegenuzuzusevi.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/powikub.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/gafabaxaza.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/volazezogiva.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/remigowidapiref.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f8df8358f---78126849094.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3b0a23c9a4cfe4ad31dab1cf62b13d01/81380674679.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/fomadu.pdfIn PDF document text
    • https://infotechbg.eu/file/32879568341.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/72909476392.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/55954f1d8815307207e271c080c8bf7f/94169222125.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/jatuva.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16091046838696---kasepemojezofuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=russian+alphabet+chart+with+englishPDF 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_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 10904 bytes
SHA-256: dfc58d938474883e5fe1bec59ba89bf4ac985703eb3dd44f40193e554245f059
font_01_sfnt_off0000dd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD84 21380 bytes
SHA-256: f914a405aeff4290611067491911b6f5314ecf9a149f34718eaf6b1522d5dfc0
font_02_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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