Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa3e98c5d38fc16…

MALICIOUS

PDF

83.3 KB Created: 2021-07-08 08:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b01029a45684e5eb0839d6bbdb6375df SHA-1: 6c94f6d1c6ed80c0e5ebe327e1cca3b36323ce3a SHA-256: 6fa3e98c5d38fc160865aae2b342eb0c2413e263ed1d1757601a90b3a8a53633
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of multiple external URIs and link farms points towards an attempt to exploit user trust through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://asianmosaicnyc.com/userfiles/file/wukazedak.pdf In PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/rhk1jdn2gsbt4viscl43bg83mm/temobokilibulesutakujoz.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a73460cd7216cc2e856c9a4e807e910/wudexivizuwat.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/sironojanudux.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/86b5r138c2smt4srtv0h8l3tu1/nazejufozupufawexaw.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/edscumer0n0djls8obnj8g5o44/kedipozujawelonitixukibot.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/93090339397.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/rukunasafegowil.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e8c33b14c5---vuvovuzatafamidixati.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6d9ecaf6121bbc709b98200198a82c21/gatavojofivurutepilapinon.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/4b1174b84ab5aec53efedb4761036e3d/75473938945.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beea7c1032e---gewimokexanoniraxepitiba.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089082b9ec97---xademorarovu.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080beee6dce7---kuvurakulegiporulixevu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/3ngj09an763auoq80b20p8umm1/30926810967.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625561945.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/821a44d838967bd6a3598d92ddfe820a/liwebisawuvuv.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/voq6oa355kvm2vns0rn24bipp7/xalagulelefabab.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/xegukop.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-7/20210507083709473431.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a4af04ce0fe---84220039601.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/0ceda4e724a7185cc85642656f8a7246/juvidasesutupuxipus.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/vunukutulobof.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/28996676737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+send+a+contact+to+voicemailPDF 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_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 10576 bytes
SHA-256: ad038d13eff419ce9ea47830dbf64977712bf6e14d9c650f045f54f5458542d0
font_01_sfnt_off0000fa4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4B 17320 bytes
SHA-256: 32f02d79e168c61b6e687488ee8ef7c52286938dc6d3e3c4307192b9351bea1e
font_02_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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