Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90c65c5783d3e57…

MALICIOUS

PDF

83.6 KB Created: 2021-09-16 17:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 99afac1791387ad7fb384e6aa31e41aa SHA-1: 70137d3e78dc210e71c54e3a6a94170e210418f6 SHA-256: d90c65c5783d3e57292ff2e833363c21394a4e919cc6eb11b8c2513f34e3e39c
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on potentially compromised websites or disposable domains. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to direct users to malicious content, likely for downloading further malware or phishing for credentials. The document body was unreadable due to encoding issues, preventing a more specific analysis of its lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://m3hotels.com/userfiles/file/fiwavawonotoze.pdf In PDF document text
    • http://vinczeandlaszlo.com/upload/dejexa.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/40206451315.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/73911426880.pdfIn PDF document text
    • https://bwhe.in/ckfinder/userfiles/files/zabuxikufilizetedijafajex.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/67590360971.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/78666306598.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jikifa.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/47540475161.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/tojitaxolokumagapusi.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/99415908313.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/jogaworupelejup.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7b59ec79---viwobebuvenuweko.pdfIn PDF document text
    • http://rs-entp.com/upload/file/19682040163.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d1897ae2---tozabedupomugogotezowa.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xotolufujelujimujuxeru.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/63958506037.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/16832652994.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/sixorida.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/litosexuj.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/jejevijizodoka.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff59f9e746---wokuti.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/24671703744.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/9162956188.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=download+fpv+freerider+full+version+androidPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/pixavuto.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_off0000d58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 21720 bytes
SHA-256: 65d8a80dc38b922de9b827a468cacbbad82be4db5bd77bfe67e13899ba18794f
font_02_sfnt_off0001264d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264D 10644 bytes
SHA-256: 7b22ab8e0decbb4815a7258064126f5205f07a2a7531b92b7dccca7dece15656