Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae080d77ba4ed6c…

MALICIOUS

PDF

71.0 KB Created: 2021-09-27 04:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 04a93fa5edb4c32a5c285bc1af95765d SHA-1: 8e474d10ec0b3a077df926a72df529c089031670 SHA-256: 0ae080d77ba4ed6c0c4b5e01f05a2876d6b6b3231bfa8570721d6ab5c51c2a11
96 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests an attempt to lure users to potentially malicious sites. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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://aqs-group.it/userfiles/files/67160874275.pdf In PDF document text
    • http://aylabawadi.ae/userfiles/file/ladekobutivokax.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/1487172819.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306818d75ac---goniwebanusi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141825c579e6---lamejajovapubesosol.pdfIn PDF document text
    • https://hram-uspeniya.ru/ckfinder/userfiles/files/76757961934.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/78018599609.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/99672509899.pdfIn PDF document text
    • https://cecprint.com/images/file/27374664855.pdfIn PDF document text
    • http://enewind.com/pliki/file/jugikaxiziligenetarus.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/9dcb6588ffb7a2cd392800bfabdffc73/51879836852.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/fidazabedor.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/wevazukenamalan.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/gamisomaxep.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/29956693840.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/88477663833.pdfIn PDF document text
    • http://baove247.org/upload/files/18117977498.pdfIn PDF document text
    • http://boardmark.com/files/file/janunupan.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/89470803196.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/56301749435.pdfIn PDF document text
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/fukexabipor.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/36740205225.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b6242c0097---xalixadofowefugak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+hack+insta+followers+proPDF 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_off0000b286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB286 16108 bytes
SHA-256: b88ac717c6170e7b6bf07af2740cc5147caf2e7c5e2f081817db8d69c3870a49
font_01_sfnt_off0000db94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB94 10748 bytes
SHA-256: 8836f550769887181668342dc0e69b3cbb98054bd4c3c5d3759cdde5445e8e89
font_02_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1