Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ac9576c76f36c6…

MALICIOUS

PDF

81.0 KB Created: 2021-08-08 23:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2bc138c14d90348011e98ade7c55ddf0 SHA-1: 6d743bfa8238d00546cd6b0c8e120cd44be4255f SHA-256: 12ac9576c76f36c6a79a01b66374ddc0a296e9d09c5518b0aeb1c315f375076e
164 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 compromised CMS uploads 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 for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://garglob.ru/uplcv?utm_term=how+to+use+solve+function+in+casio+fx+991es+plus PDF link annotation
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4ff90b0ee---69704802607.pdfIn PDF document text
    • http://coumert.com/images/file/jisotamep.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a57cfbc2---38623240513.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/59618851602.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/sajuludekemupov.pdfIn PDF document text
    • https://medtek.vn/storage/file/gegefakakaramonitedeb.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d8d7af82a---mokakumilidiverew.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/88252167120.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///giwobogexuw.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0038dae097---1684209902.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc639fdf084---40611991740.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/63190427551.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f601b9829---32850216582.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa6050dc6---vegenipisukaz.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fb67491c12092335c69d1a9fd23e44bf/35497068867.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f128b3f9aea3c1069049eb2094c9bb43/fegub.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8b4b0658aeab3083c86ffd3db4f4d917/700344459.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f92dfc62337---85765046009.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/19810473020.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/62458496766.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a937e89716---97131223252.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/71261474196.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/65514460493.pdfIn PDF document text
    • http://aardbeienfeesten.nl/uploadimages/files/82101446872.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/85481177968.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/f823e3a2dfe3f46ae1d365b04d77083b/ruvenaxowuvapikib.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/27258118824.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_off0000d7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 16740 bytes
SHA-256: a5bbfe7fa94dff5a833713fb925c49f673b8e7847840d818bd652f2d7f498c0a
font_01_sfnt_off00010330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10330 10940 bytes
SHA-256: 8be451db0ffec34b1dbf49bb6a55f89582a6715d4785772f9de093d43749fe89
font_02_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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