Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e882a2dc56382d…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 23:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 586ecafa22d04abf8f16b3929bdce20f SHA-1: a5eed59984d9fda13c8a1dae968a747c5f8a38d4 SHA-256: a8e882a2dc56382d69c8ecac6bbe44431fa7a5c68502e27d4495f88a2a59b7aa
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Static analysis revealed numerous URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The PDF's structure and the presence of multiple external links suggest it's used to lure victims to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=miranda+v+arizona+full+case+pdf PDF link annotation
    • http://cokhiminhhien.com/media/ftp/file/sawirelakokiw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b6e33f0bf---89001231844.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/75849330332.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/nojavefekoguwujawuralawe.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/68036496867.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/11319627811.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/wujujosudigukeliz.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab80d1041ec---65978294471.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/76897359818.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/jadegutefajiwusuzu.pdfIn PDF document text
    • https://plasy.com/uploads/file/59698803077.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aebdb71c6---93472273862.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca42e1eb5---gotogumemajofetugirup.pdfIn PDF document text
    • https://ultralloy.net/upload/files/jedidulawe.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/t9thu5jjl3h3dr7ih6pgj9ifa9/nogarozumomoxapiva.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/54973916941.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/resanusebukatopixan.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/83407915714.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/e577660b7a49cbd8c91e047776e8e9d1/52995270153.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160767849d9de1---74209244048.pdfIn PDF document text
    • https://pubs-icfas.org/icfas_new/dev/ckfinder/userfiles/files/mojiginofotidefasofemul.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ace0824d---2347297121.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dimum.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607decea45ef6---dujerakidafun.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/tafimebemujuzafa.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_off0000e380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 18312 bytes
SHA-256: 84d8dc40e49d4e26158b9cbc58e70db568a495ef3d50fe710f0c480cda4c50e8
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 10736 bytes
SHA-256: b71540192abcefba458ed1656cde0bd3354c6d30f208ba740dcc8c442726068e
font_02_sfnt_off00012bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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