Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba56a86f424b425a…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 00:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8bdaddfcfe4b0870e9c1b4648806aa4 SHA-1: 0162ee5bc8788e7ada54e0c513aaef028e34c540 SHA-256: ba56a86f424b425ac884765eb26f84c033876887692a25e25927d7392ab97a23
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classification and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=how+to+insert+signature+in+preview+mac PDF link annotation
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/judubekexolodinix.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc7ab8150a---piwekuvosuwawakujarak.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/63969259704.pdfIn PDF document text
    • http://runo34.ru/attachments/file/42297691682.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107b9c82c75a---83410289363.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/riluzikimijet.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210503062855151.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/fifotesutiwuximuwifizogi.pdfIn PDF document text
    • http://chipgene.com/image/files/20210813_230818.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ab07bdbddd7f4c273b4dbc4d3fad248b/sokixenubobuzusitoror.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608945fa57e32---72309679380.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/pqql99kfvuphf8cg973n59apm5/92394522733.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805ed768ab0---31509355260.pdfIn PDF document text
    • http://tnslib.net/userfiles/files/73638963410.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23b2bac0e2---zoganobesepemufujekaza.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/t41frj7s3frhr4ik9gth43p606/65373423815.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9882813dd5e85258146de4ba27e58772/98059263175.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/3838153428.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/64640331539.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/11282657195.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/mapibodileretonafegugu.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/vl9t9mu71rbsp8glenfq45l1v2/44725027127.pdfIn PDF document text
    • http://ahchala.com/img/file/68490059061.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_off0000e029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE029 17516 bytes
SHA-256: 9a1eba17d6ffbc515f50825769e004843401633d72685756ab7fa8edef74c696
font_01_sfnt_off00010cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 10916 bytes
SHA-256: 88d7689b9975f30c63950214828fbde0d53bd4d0b7fd3e42eb40ed69768fed08

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