Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aea33190cdabdfa…

MALICIOUS

PDF

78.3 KB Created: 2021-09-06 15:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c921686facc036830dd3309dd2354723 SHA-1: f82aa5947f7dc5edf95c201af5e4995dc435167a SHA-256: 9aea33190cdabdfa5f12288c2f64b469bb284914512b208a7b8ed814c4b855aa
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 WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff6ca7b049---texep.pdf In PDF document text
    • http://kaithompson.com/userfiles/file/lotuxejo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/m7mgrrjk0qc921gtisnssqf7c2/37186027330.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/kisidikipudimafegokatovu.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210730023002.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/38f5a40c46e2f9216f52b7d8fd8b7af0/2666641690.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/rotugotetewel.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f5bd1b82f---26107802559.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a277449a394---natamif.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97015593532.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/dufekedabamilogewo.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/37014715196.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/43937201918.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54f4e5bfd---naginamidudapunoxok.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/dffa1120dc37a4bde95e2915f150b267/pabonoxosuj.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/cc20spokj33ei9p0dfg6e9q3ov/wiputagakedejunixu.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/piwidezevibareguzufe.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aced232fddf---85592873002.pdfIn PDF document text
    • https://tuvanthietke13-5.com/webroot/img/files/46710758476.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b82006d2fdb---17627340215.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/zudajamowamafiraxizodudib.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/vubumunagod.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/gikiwawojiduvovipeni.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/10517859192.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097fdf9cd3de---forane.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b841d3dbb---52146915098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pmbok+6th+edition+free+download+pdf+spanishPDF 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_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FF 18088 bytes
SHA-256: 2ae611e1432a5b7a93b00eec3e2302ee525985dd4e8d7de0ebed31a26474ec90
font_02_sfnt_off00011110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11110 11248 bytes
SHA-256: ca91045f76a897db1ca9c1e043643a834153ef86d2926111ca4925f86db812b7