Malicious PDF — malware analysis report

Static analysis result for SHA-256 46eaa3781fb5de62…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 20:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d4344a323efb4a40fc2f971d291fde3 SHA-1: 14e6eef4fa04f1ace6a5b307bba8db37f8d8a416 SHA-256: 46eaa3781fb5de62ff1ab079eae91d0dc79f1ef732ad212d44cec66126b8b23f
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 upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and embedded links are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314836c9ad6---4526169395.pdf
    • http://kinel-hunter.ru/upfiles/file/25953040037.pdf
    • http://studiotecnicodavico.eu/userfiles/files/196314551.pdf
    • http://vizcsap.hu/files/file/45253714922.pdf
    • http://att-na.com/upload/25864013918.pdf
    • http://abwcoliseum.com/uploads/files/73229344867.pdf
    • http://naso10.com/userData/board/file/41223363718.pdf
    • http://beastyenergy.com/userfiles/file/tuvegefabanuvalunojimol.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/soboziwosuso.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4285db5db---bivumodudubataruwi.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4fc80a2b1---maruk.pdf
    • http://fiumaradelsossio.it/userfiles/files/gakegujesovirexowosuzag.pdf
    • http://chanhungcorp.com/images/uploads/files/17999653103.pdf
    • https://wtmasonry.com/ckfinder/userfiles/files/bijaxakemojafezo.pdf
    • https://www.sistemkabin.com/ckfinder/userfiles/files/55528677380.pdf
    • https://sporyolu.com/resimler/files/88657215750.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161357d70bc40b---buxirerawunegel.pdf
    • https://easternresources.net/ckfinder/userfiles/files/98030659042.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130c82fbacbc---23673591164.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7e2b673f8---8335482581.pdf
    • http://ephtour.com/FileData/ckfinder/files/20210902_388E1C015551A361.pdf
    • https://edgecs.com/documents/wiborerilanebiv.pdf
    • https://pracowniatechart.pl/fckpliki/file/1822583927.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+print+specific+pages+in+pdf+windows+10
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e237.bin
d46f067cbb537b98cf821a65595734541456339a046d72c2d69493f28a927bae
pdf-font-stream PDF embedded font (sfnt) at offset 0xE237 17080 bytes
font_01_sfnt_off00010e45.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 16792 bytes
font_02_sfnt_off0001265c.bin
100122a1cdfd528cdfac2d6c59c190c7fd3af71d5bc5da736cd4539a99fe2d57
pdf-font-stream PDF embedded font (sfnt) at offset 0x1265C 11000 bytes