Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9dc5fa53b392824…

MALICIOUS

PDF

97.9 KB Created: 2021-08-05 10:00:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49e2fb06c224e58bf3b2658fdc2e176f SHA-1: 54c671f29f5bd6d58904e3ade9cbcd85eb4eb322 SHA-256: e9dc5fa53b392824350e300096962059e0702b225d9e04d5e55f5ef041cc3547
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://armanetti.com/images/jonejejazutimogida.pdf In PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868f392b0da---debibedifojufiduse.pdfIn PDF document text
    • http://bakkervoorwinde.nl/app/webroot/files/ckeditor_files/files/dotadopinevu.pdfIn PDF document text
    • https://birudongker.com/contents//files/lixufufubugeruz.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/50gtbp78192vj1ohthr85himp0/92635906652.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ea1ae1674---14447946247.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/vaxifitaxel.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e89728549---zapuvul.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/25891204734.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/5523222251.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab384f2a6da---69163832126.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607313d8a87a3---8266493731.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/xorovobixarek.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/2976a475d21c04003f3f9fafdf8ef6f7/6246485964.pdfIn PDF document text
    • http://sterkrade.net/ckfinder/userfiles/files/vonok.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/3516083955.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/2bbe3160dd302c1bf245b1c70b2eabe1/73528054684.pdfIn PDF document text
    • https://banghenails.com/upload/file/posotubinejinuwunisata.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/62817477737.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/91e2cd2eb97766344cb80b2850fa1ad7/32009531252.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bf4e8574---31720160412.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/2361067805.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/40665011855.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/28091563566.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/lotikawog.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/53474441682.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=agriculture+officer+exam+syllabus+pdfPDF 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_off00011af0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF0 16696 bytes
SHA-256: 04c8c64a3ad41cd8a8b1fd3fa6e90784111122e878a6dab9b3eeb792a0d215d2
font_01_sfnt_off0001466e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466E 11296 bytes
SHA-256: 64832b098de13b9fa2a6f31f92dece8457cb8ae235f02f85ced8c2f2e445b50d
font_02_sfnt_off000160b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1