Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb8033c59338ab12…

MALICIOUS

PDF

82.4 KB Created: 2021-06-28 18:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0eac484e561bffa037ebf64c149b06b2 SHA-1: 26eec4a409794cc9bf3c1bfcafe9fec434a2dc74 SHA-256: bb8033c59338ab1242dadd054e4bc3daac15da76c550dcae925d6cf14e3e79e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to compromised websites and are designed to lure users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The structure suggests a link farm designed for SEO manipulation to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609485f7797e1---razutitulaxuwabe.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc19d69f70d---wigalupowidumefalinetagon.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/noikcr0obrevpft3mf5itoi1d4/mopuzisawog.pdf
    • https://wickedcheesy.com/images/file/23972935571.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919c015d6c2---nemizesubo.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/cked2j5cmvfrth05mjdgd2l82v/zuvisajijemuvolumulosuxu.pdf
    • http://meta-min.com/files/17654345091.pdf
    • https://daiichitravel.com/uploads/news_file/zevebe.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/d58234ec3db5e1ae3ed01b7af27cb562/61306828802.pdf
    • https://bataretak.com/img/files/file/devefizejadiwidalimes.pdf
    • http://brette-animation.com/userfiles/file/filokajusudisudimopog.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/so7l1h13vr1jekhcncgtjvr0qs/burisosaxefu.pdf
    • https://ahreco.com/uploads/news_file/bipad.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4idjg5ss15thb5becu3molmkh7/82326612835.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/avr734e6hsm6fu5rij8bj24fbs/jobemuzibevewogetovalegom.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cc1dddfd78---17221554434.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/96537463408.pdf
    • http://cbgnfinance.com/userfiles/file/rojuj.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91393bfae---10290241857.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/cc7f288d68f1afbfddb0ed9a74d6ebc2/93474040842.pdf
    • http://didula.com/img/file/26689270379.pdf
    • http://alphasigmaoverseas.com/userfiles/file/5149209584.pdf
    • https://majorsagilekvaros.hu/uploads/file/vizuvekenufa.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0a0da4ffb---jetibari.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=an+ember+in+the+ashes+read+online+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1e.bin
3280b91d9742d0f968ef366c8fe4eec98920d8fde6355714e9d160a461407f3f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 17120 bytes
font_01_sfnt_off00010bac.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAC 16792 bytes
font_02_sfnt_off000123c3.bin
4a14f6033e66da1a7afaed6d84974078e7575fd59705b87332078c164cdc36de
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 10740 bytes