Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b5985c8576a3f7…

MALICIOUS

PDF

80.3 KB Created: 2021-09-14 03:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2c2c860cdecf5ccf15929755e6edea46 SHA-1: 7e6cf1a85a0a0f8a71e9a44e88018f866c4f53f6 SHA-256: 07b5985c8576a3f74b7a2a9b2411f6f0130f61e2d6e43c51c8bac194e3972620
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://oniceh.ru/uplcv?utm_term=nba+live+apk+mod+2020 PDF link annotation
    • http://kemnhapkhau.com/upload/files/wopajadov.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/lupapano.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/povinebawivopisawa.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/95455206134.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/daguv.pdfIn PDF document text
    • http://boldogelet.hu/media/makasaku.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/nosudulika.pdfIn PDF document text
    • https://red-adlay.com/upload/files/gixajot.pdfIn PDF document text
    • http://bagodilovaspark.hu/userfiles/file/mogab.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/5tv2g7kiceeiquu19iotabhv30/94441819583.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/dedel.pdfIn PDF document text
    • http://haki.vn/uploads/files/visotalopopatojupe.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/navipevanabovuvolakuwa.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/8f3262ebc2752f05e0c869cafdadf3d5/zabilejotitazizejeje.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/63972469755.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613da0417c311---dawetoxulubovetidobata.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/36960716697.pdfIn PDF document text
    • http://freeorden.com/media/file/gokodam.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/givewozesamaxilax.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/86066274049.pdfIn PDF document text
    • https://glozor.com/userfiles/file/79275570736.pdfIn PDF document text
    • https://rinducm1.com/contents/files/38728245982.pdfIn PDF document text
    • http://4yoga.by/pics/files/gosulakawopajuxuguwilom.pdfIn PDF document text
    • http://letdentalab.com/img/files/toririxawaxogosegol.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/suwewusodawokeju.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/nixumop.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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 10600 bytes
SHA-256: 7e4ec5ee6965891ea6745f7f95005ddc7b86d566c72b4b52245217910153ef80
font_01_sfnt_off0000e710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE710 19924 bytes
SHA-256: a023174a4dad07278b91b1ad5ee7de6a5a0f37cc7ef3d85b9624a4d6ef25ea36
font_02_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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