Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d84fd4b5608667…

MALICIOUS

PDF

87.2 KB Created: 2021-08-13 19:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 8702445b844fd99ca37586edb662d121 SHA-1: f6f9e1f9fd6618db981f9c0328cacbe35aa8b44b SHA-256: 97d84fd4b560866763da735692081d04f1eee5969d9797597e1d340757354f85
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=magellan+gps+lifetime+map+updates PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/3eec1bf6b6844863b1f2c11f6e994a4f/wafozawesa.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/34167965940.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/08a624dae96b5221db68a5b635ac0079/neboteboboguroxem.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/pavimoziz.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608877e4f144e---lefabuvezeverovuvofomafo.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16076a5c08a474---pagoguwawunikobewo.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/72304639550.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb3d2cb71---30809203704.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/26628847078.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/23820184623.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/70241128995.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d608e61e4b5484667500fdd32c0096ab/63773178135.pdfIn PDF document text
    • http://halmar.info/userfiles/file/zifozapisegikobuf.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/atta18nc0v1m603l4i3qar3rkh/vufifu.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160901cc25fefe---ruwexipevuxowikikan.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/u44dfsqb2n34sie16ig1f9gp0h/lajogiresiga.pdfIn PDF document text
    • http://chinalabware.es/d/files/jirotiwasifanodowezuruwex.pdfIn PDF document text
    • http://rilta.net/userfiles/files/97635704509.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210522203358.pdfIn PDF document text
    • http://hbaoge.com/upload/files/7780461467.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/fididoj.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/61265570471.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b182858ef3---vixezasana.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755a049b865---digipolarel.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_off0000f18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001099d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099D 16848 bytes
SHA-256: 071a052772a525b1fae05597975dea86c5e1bac099fa4b22989dda4b91b5e902
font_02_sfnt_off00013592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13592 10716 bytes
SHA-256: b5dfa3ff5f8742c37f553963d4926353248889bb27ab890fa02ea6eab3334127