Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b3a6d075e808c2c…

MALICIOUS

PDF

91.0 KB Created: 2021-09-09 11:32:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 40e4a0a8329440910a58a52986dd77c8 SHA-1: e27efa3b08a02a1ae8967d05eaa4ac2d1ae1adac SHA-256: 0b3a6d075e808c2c08ef05c1604528fc40987a3efeaffd10bde4746c0e8d13d7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://anduong-nhatthanh.com/uploads/news_file/2362898870.pdf In PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/jidopagusapubivokapa.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/pekaduwajewamizipo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/perabevokagozoxuzobezub.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/85414186534.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/66556309452.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/j3hj3e3344jk44q37l9abfqiv2/lojekakebinasa.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/8017801516.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/2249722251.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70683595059.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/muxadu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130084b7833a---sumazitipoluju.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/jozinalot.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/lawamelofuso.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613613a323e26---15889079211.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/39062991070.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/katogovotodeniw.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/23485505210.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a9484876b---87641441874.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/2fc77d240ace4df75a0f2aa270e1c41c/falojenif.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/10db7b54d054b5e9d84a0369230e6b75/80198996008.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=justice+league+snyder+hbo+maxPDF 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_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 19424 bytes
SHA-256: 6f50b34ad4920451cc3ffec07991f27f44d019d241c4fc38b96eeaadf1f46f31
font_01_sfnt_off00012c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144A6 11264 bytes
SHA-256: 64c11b4786bba4c5f4cf609daae1f5e280994a696794e335192581c195e767f6