Malicious PDF — malware analysis report

Static analysis result for SHA-256 448e7bd7aef2de59…

MALICIOUS

PDF

103.6 KB Created: 2021-08-25 03:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 43333d54fe51d4be57e032cd14e076fb SHA-1: 67477341db507577643127aaaa7b59e9cb21d8b9 SHA-256: 448e7bd7aef2de59736ecb7e4c84190aa4c7198f4ca6633cf1eb6ef0acb7f444
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest a tactic of using numerous domains to evade detection and increase the chances of a user clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/p4tcmh83jgigd8ustr2lb26p91/guvuxak.pdf In PDF document text
    • http://aps-mes.com/files/file/seduropep.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/72776583185.pdfIn PDF document text
    • http://klenderbio.com/upload/files/88707258196.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612560b57f476---fakusevorokokamewutuf.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/e41866d29cbb8a36508168c4021ad2c2/95134096625.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/76557619890.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/53546091263.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/dedugupigemebulovit.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/84024997182.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cbf8cd084---xifigifalanarejenigaf.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/zokibibuxilalepex.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab92bfe8631---69020632190.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/77116927149.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1uj6ua0p9kqn3ddbgsnqh8pik4/gosoxe.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106080224.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c58499aa04b---vufes.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160fa81a568240---94367873236.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/35397459620.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/71828385122.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/36895279944.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/gedesawigadebiru.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d256125e8bc3dc8e6e467c853a124872/80691029337.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=roy+rogers+birthplacePDF 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_off00013056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13056 10848 bytes
SHA-256: 60f496941a3ad7052ad5cf8975013e179dd0d29a308bc9e91519371e3e399d28
font_01_sfnt_off00014953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14953 17384 bytes
SHA-256: 14a8839b05a51e02f9cae8971a3eb34b24986de88e367dfadd79b4017b239e52
font_02_sfnt_off000176d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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