Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a99c757ac0bdcd9…

MALICIOUS

PDF

79.7 KB Created: 2021-09-11 00:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1dbf776a1f4b43f5933a6c4948fc0bd SHA-1: 29c675ddef4fb0b3bb02b7af6ffb467cdd59ce67 SHA-256: 4a99c757ac0bdcd95b8418185cd6308665e8274ac38ecfbc93bbeb0890f522f6
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 WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://speculatio.in/ci/userfiles/files/99388732264.pdf In PDF document text
    • http://heorungminhphat.com/luutru/files/pakisewoxijufasa.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcdaf52a35---forajizajoni.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/danunewapinidabovogupo.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136878b9f10d---momokeg.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zuwidiwezorapam.pdfIn PDF document text
    • http://ubest.ru/images/file/titubi.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/94772309129.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c808724eb---78623690860.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132a99e8d028---2370136718.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/zuwuzenalamupivimepesu.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/gawelakubajaxuwewawefuz.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/sikilafuk.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/161387d2a08f94---42828155711.pdfIn PDF document text
    • http://co-mit.com/uploads/files/12177948056.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210911_063031.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/mipodobuwilutowomu.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/57194566215.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/sezesadiva.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/24734659278.pdfIn PDF document text
    • http://sportingclubalbinia.eu/userfiles/files/pakuj.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/28190772533.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/60547982142.pdfIn PDF document text
    • http://ap116.ru/userfiles/file/zagewa.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8648f1f62---14020032179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+delete+applock+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_off0000d0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0C5 18168 bytes
SHA-256: 774858a7beae52b768b978607539b9969f150dc81b2cf69d9ac111510dca25bd
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A7 10508 bytes
SHA-256: ec74b52c374362aed2cd8528b6dcb1a365589541ee2aaa3103b7e8f6e2135c9a

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