Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad8cf9fdc415583e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 08:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0aec6c47d1a6f852ab277f18fe8aae44 SHA-1: 74f02cf4c5ae5fbba9a74ae17dedefd3355dc274 SHA-256: ad8cf9fdc415583e382deb68622212c9485a48e700691fc6f0b0227991e6cfee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • 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.
  • 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://music-summer-courses.eu/upload/files/73743500054.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f08c7802b---vurobosalazipa.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/47259144171.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/29942449889.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/zabinefaxodidix.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/sisoviwupamirilubamobar.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003eac4717f---16477605350.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079440b93ccf---botozubusowosogilesebo.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/wikij.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/58574435016.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/c2cofbs8t4vot7i1htn6i0uelc/54905899077.pdfIn PDF document text
    • https://orrizon.ru/images/file/93610574362.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/98c75d1130d4f6237801c2b2a4e6d5dc/baxinaki.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/fimatofojawubowu.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/a8irde22mc9prf0c1t257f8k66/98256119734.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/49763636674.pdfIn PDF document text
    • https://businesslife.com/content/file/71516401055.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/mesuzag.pdfIn PDF document text
    • https://premium-house.uz/images/file/kalufiwevipefekuda.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/r9psmct6b1lpc8jp0tpu68phem/korenet.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/jofelaboziju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=memory+palace+of+matteo+ricci+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/b06d709ff0e2acca6c9d8553ac7c9cbd/51874852149.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_off0000e789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 16776 bytes
SHA-256: 5200af1c15e96aa45dd1a564139702686266bcca48b3cc3b054a00a4dd6c91e8
font_01_sfnt_off00011334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11334 10616 bytes
SHA-256: 55cf7c7848cf362e817b22a026170004e6d3db69a703258c7a1d3df75adb7fc4
font_02_sfnt_off00012b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.