Malicious PDF — malware analysis report

Static analysis result for SHA-256 76543d1ebd7a9a11…

MALICIOUS

PDF

74.2 KB Created: 2021-06-28 00:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 16c7c7eec2428ba13d4c599f83ec47a8 SHA-1: 5d260bd4ba61d986f39629e3cfa39adc347d27dd SHA-256: 76543d1ebd7a9a11d6f2543e4c13bd49510c1e14773b3132b7b20dacd20edd5e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of numerous URLs, many hosted on compromised CMS platforms, reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac14a743c---54495749414.pdf In PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160794a6c07f6d---zopuxofu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c91c2a87486---43580977240.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/230dc0da6c5e1bb67380eec5306799cf/vadomidisudonuwereniz.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c41dd6d136fbb0793b4b895cfaeba988/84959082840.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/13253067734.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/fopul.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813d143e542---32289936378.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/25303748207.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/rdsnk6h3u70ob4dqeehi9ktoq1/52301697889.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/4114092202.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/57328596713.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/15734797293.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/85d2148b0b65464399492df2af65bdf4/4014213371.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c77039f3464---64773144736.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7f7a9b8f---tavoziwibakap.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82028051640.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/nesejij.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/82097118957.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/87408711624.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d415b0bb3bbc9dda09dfad6bd9f135ce/50724562275.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/1ukboge7uaj5kcusn440uqmij0/17723047987.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/64384353304.pdfIn PDF document text
    • http://celiapopememorial.com/clients/4/45/45605e685ba8a3b32f56966823665796/File/rebokodilozatiparez.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/74885996524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=ios+money+making+gamesPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/734839024353b0f782f4bfc6f08af1e0/sudadiwikirati.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_off0000c397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC397 10364 bytes
SHA-256: 6c74263bfa8d4448f85982043f5768808355de0a41ee1300ebd45dc5092008f5
font_01_sfnt_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 15736 bytes
SHA-256: 0cd9cc1610b830aaf96056d6acfc1cd55441fe94ebc3dd2ec22e8479542cd0a6