Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d75fda5689beec4…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 22:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a9523f1003f7b57b92701dd9f67d1b1d SHA-1: 6f1297570445012d010bc03e097c81b7fdcfef25 SHA-256: 1d75fda5689beec44c9aacbb93231dfd45760d6c744b794dfd795736b3e2b8a5
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crewmak.ru/uplcv?utm_term=floriculture+questions+pdf PDF link annotation
    • http://vodnik48.ru/content/file/81431706664.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/69601561714.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6012df218f---sebinasizuzuvu.pdfIn PDF document text
    • https://superpart.com/files/mazut.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a427195b1c1---69144414681.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/2086278173.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0e7ada97---nunirevikanumoluzotu.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/90587770809.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/suwozipopepojovok.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce014ab017---zezapebufetobux.pdfIn PDF document text
    • http://landpas.pl/upload/file/jobilupelilarenigiwupase.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c720b881f---dosugubosigatidosiw.pdfIn PDF document text
    • http://ibarugi.com/fckeditor/userfiles/file/37020436895.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/60814280050.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/qk0e1b6f4nfvn9rfie5mlngptj/36032562785.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/luxot.pdfIn PDF document text
    • https://bio86.net/fichiers/13441279670.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rolumimaregufipuzulamuxe.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/28998799835.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210814_6DBC3342CF54FE61.pdfIn PDF document text
    • https://tivicom.vn/upload/files/letexisamuwawifotabe.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/38529299853.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/loridapidube.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_off0000d306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD306 17576 bytes
SHA-256: 58aecdc3a9e5a7ccaa415280fbf4813c316ac30d0ecdd6fa2fdb51af6c87b8a2
font_01_sfnt_off0001005c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11873 10672 bytes
SHA-256: 35407dab362b9e0b295f6e9cc2059e5b87d629008335d98819ef10529ee2b502

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