Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a3bc3f8822c2fd…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 01:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7973b3b047e11699bca3de149bfef6bd SHA-1: 24777e9ad6bc47f924e6863fa88a3d4f53a54f0b SHA-256: f9a3bc3f8822c2fddf8d50485d21b26f71904525bde17dffdd8f6cb5b5476dbf
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, indicating an attempt to deliver a malicious payload. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, originates from wkhtmltopdf, suggesting it was generated programmatically to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=gun+games+for+iphone PDF link annotation
    • http://bsa-billiard.by/images_from_html_editor/file/58257529844.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/lewum.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16139182bd04ef---21184065546.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/70019851238.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/90661321577.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/96793528775.pdfIn PDF document text
    • https://euchebnici.com/img/file/35023364656.pdfIn PDF document text
    • http://enricobarraco.com/files/vuwotiwasavudamoj.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/fkvvq7h7o2n184rlqdf2t42d8b/davapizurimagusajonoxoxis.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-5/20210905025955490931.pdfIn PDF document text
    • http://usagimatur.com/files/others/dogeranoxoxoj.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/gadugisakavidipanu.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/53907095315.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/detitel.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/zejokagosazivib.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pekikoreduzejexogulojerow.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631485686.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a02c24ccea---23585620404.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/10685482578.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/xuwuzosisezini.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/nodowofenolegevefuxizugiv.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kizomapem.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/jevuzidolo.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_off0000dddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EF 18636 bytes
SHA-256: 21824bedf26fd4bfb23a24d7d1d19bcf7ba95f3532442909f01781335b5916bd
font_02_sfnt_off000125a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A8 10800 bytes
SHA-256: 7978c6c05549624a6e214ad7f5687122e342ebff51fff3db9cdda36623712665

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