Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d683a1e4af40cc4…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 07:54:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8833e884118e888e60237889cfae6db0 SHA-1: 8b1ce23194e38d65f2109351617a7b221d3528bb SHA-256: 6d683a1e4af40cc4279fb409afb7ac8eb0c8fa5884ed3d5713e78e99ebc07713
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The primary attack pattern involves luring users to click on these links, which likely leads to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://bdsps.org/slbdavbatala/userfiles/file/85208376777.pdf In PDF document text
    • http://nguyenthaotech.com/upload/files/78983672116.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/45490059142.pdfIn PDF document text
    • http://sun-eko.eu/files/file/31997355618.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/vupafodizonabu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2f940ed39---81715040908.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/14211127896.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/30046554804.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/98dbd4fd93d3d157ffc4e80d47722c60/vufuvinuxakomanaja.pdfIn PDF document text
    • https://umartravel.com/files/pafixujexefakovakoxurix.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/50966925557.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/laxuv.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0717f1de1---83640013539.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eea781c6f8---xujaxipibuzokusigamomanex.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/89844495599.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/laditiv.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210902_8E730EDE01449C88.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/26450153204.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/66167494838.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/69560936382.pdfIn PDF document text
    • http://scantech3d.com/files/41557026960.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/bumekipujanufabofovinifa.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b7q5v3uigvk46997j6jvt8hs0o/resar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+turn+on+sync+in+androidPDF 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_off0000b819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB819 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02B 16488 bytes
SHA-256: 28d4f519298d11604d04b38abcd8f2ba2f8eb89703678ac8ff9de07da56d604c
font_02_sfnt_off0000fa42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA42 10476 bytes
SHA-256: ee5d4d75838182c2a0a2802a374ac97de6c4f86ae57b7a00046c98d4c8f01273

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