Malicious PDF — malware analysis report

Static analysis result for SHA-256 1835079c68da3fb2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 21:21:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 769be06b6eebba2594a78992c7229a79 SHA-1: a2fa8da8024d3fb91a14db8f7dafd93096d029a6 SHA-256: 1835079c68da3fb2c43fbf4831d77b6a39ecb8cedcd0f5ebbacf7470e76d1d9f
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection or SEO poisoning. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • 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://oklogistic.lv/upload/file/texan.pdf In PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/53742784115.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/petoribodope.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/zumawuzokawizinixariz.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/vitedulekosoguxemip.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/jorin.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/29095738943.pdfIn PDF document text
    • http://saimiri.name/upload/file/2317981503.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf0dc549b---jikemitazune.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137deb1c08f7---nudosikunadinatogugowud.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/27604752081.pdfIn PDF document text
    • https://best-label.com/upload/files/89540714225.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202196_211156_921.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/reworene.pdfIn PDF document text
    • https://melz-feu.ru/upload/figopanejibes.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/fisufirewo.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/gegosuwazuwupusab.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/rovokizivokinilek.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d943f36ae---56230471408.pdfIn PDF document text
    • https://infotechloyalty.com/bot/ckfinder/uf/files/26557611192.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/55846384766.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/41228510089.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/xojixanabebikajodovuga.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/43022610453.pdfIn PDF document text
    • https://kildevangen.dk/files/boxetikelimatoruriwizup.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/ziliraduworixopegejo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=php+manual+array_columnPDF 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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 15588 bytes
SHA-256: f9e153aeb9a22bbd1027b1bd73a46fdf1aaa56d39455ae5da6ea38c4090732fe
font_01_sfnt_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 10396 bytes
SHA-256: 5df5cbd2b503d50305abdfa5a91effb35b8ab98c2f94a9f4702e2e6d124d3f29
font_02_sfnt_off0000f7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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