Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b75ae84bb90c79a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 20:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa1436d866e6bf0b488663acaddf69d5 SHA-1: d25d1b7353426328f6574ddc1a3bf64acb85d3be SHA-256: 1b75ae84bb90c79ac909b1dff38dd0067f5f9fb15b0716ae4110bd06183a71a3
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of link farms on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chpcentre.com/files/file/49472457237.pdf In PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/27948484820.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210905230644_amFkaXRvZGlsZWRlZmlzZXBvcmVqb2ppZA==.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/89418575605.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613381458e0c4---5430540029.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/76854134804.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/vunigubisovivevin.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134d3b70496e---mowuje.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613163aadd8cc---vofubujuriratefo.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zufofumomeromex.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/77483715255.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/7111548463.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suvujaxevegawogogivolaf.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/69832241000.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/kufos.pdfIn PDF document text
    • http://shesob.com/file/files/vurapofav.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_02_21_19_52_5955.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392367ea0b3---pexaxalumabuwivefered.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f9ca252fb---65958990901.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d563606324---kovewosotuvirevam.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/3398760104.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/ruxol.pdfIn PDF document text
    • http://tznjl.com/userfiles/files/31602368706.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/rajipekakuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=obb+file+for+pubg+krPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/55859720074.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_off0000da4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4F 17256 bytes
SHA-256: c43a41aeca3976ce9fb2c3fc034b9808d1a27805982004f0c588b0cdb078d7f6
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8B 10360 bytes
SHA-256: 683a6b1f638f969866b6438b0a10834e0a3a8fe17a7171b1e0486058db7e9d30