Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec0959510b9f6cf…

MALICIOUS

PDF

80.3 KB Created: 2021-07-18 07:15:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0344e603b591d9231466a0ef538092d8 SHA-1: a792ab94650c5591c1696cfa7c888acf239bdf08 SHA-256: 8ec0959510b9f6cf258c3f97d3e43a17bbc5664e1bab44b14548d30cff49f49c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://studiofelician.com/userfiles/files/16990178717.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/696fdda5ba69389d8fa903e7cd81c6a3/wafoveb.pdf
    • https://xn--nmqu14inmf.com/upload/files/veburoxof.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/56a393e1eaa220c5c87f1e72919e507c/ninolikenogala.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d524e066ecc---81147257050.pdf
    • http://weymouthhighschoolclassof62.com/clients/5/50/50fe23896e84432c97ff20d680692bb9/File/kowuguropa.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/tm6ekhis9r3kvsbge4uaehgt0j/fovajezagug.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9ad6cd2d0c2bb7bc3b64d5da039e1f8f/wopusumaxatopirar.pdf
    • http://mesterek.net/tmp/gotugoxelonipaxog.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/9e964c75327cfdd4f7c12e46fe2c7187/naturuxokomi.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/54754316185.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d404715c4d---80801302114.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b51fd41b5774a128c6f0cc74a1941c6c/87169322432.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ffbd48e1d---90784110595.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/69feca35c8507f7e3c0fd91806d77181/4074022020.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825a480010d---mojapafukonepizejoxigel.pdf
    • http://kapelski.pl/userfiles/file/87956158408.pdf
    • http://businessvaluationapp.com//fck_files/file/90201252959.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5810c237d3---kasuwekejisamibe.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/0136a8c6aa6fa8a2f0a78cd74fd0bc32/rotetubikawirewazirevati.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/8tn45cts0n9b3q2q764mou9t80/1405554524.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wanazudaxuvekodozirex.pdf
    • http://www.predia.cz/userfiles/file/jumoralevaruratabavadox.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/de38d6im9vd8ne4juc3i87ecvv/wavidu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+change+from+picture+to+pdf
    • 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_off0000d3bb.bin
fa75782cf1629223711ad97e4306e0b466fd030b7e233529a0ddbfa2bd47a8b6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 11028 bytes
font_01_sfnt_off0000ed00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED00 16792 bytes
font_02_sfnt_off00010512.bin
998222234a47479ac8b23c0f40a431191cc3b8ff35989470fde9df73ecd7157e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10512 18084 bytes