Malicious PDF — malware analysis report

Static analysis result for SHA-256 29405b222d28268f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 14:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a394d56319485d3e5e85a1b2e7250c2b SHA-1: 8ddde87cd1aa85422aeedd6b2fb4ee30b83f7b94 SHA-256: 29405b222d28268fbdcabc5ca05779a08558b8c2104dbee04e3faad390a56b74
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. It functions as a link farm, presenting numerous URLs that point to other PDF files hosted on various websites, some of which appear to be compromised. The presence of external URI links and the overall structure suggest an attempt to lure users to malicious content, potentially for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=ibps+po+exam+question+papers+with+answers+pdf PDF link annotation
    • http://www.smwiarus.pl/ckfinder/userfiles/files/80023495630.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/3531223057.pdfIn PDF document text
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/fepajatukame.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f71920a58---77014271312.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/zubedefuzid.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/sesavinadigumurabimepavu.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f4ce6076---fisabodudatapod.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/pibpkjtrp0a04evl28jlie4hl5/14934939457.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/10110634745.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/tugemafazuledijimefaz.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/nozalaledufegi.pdfIn PDF document text
    • http://1careglobal.com/upload/files/bilexewijibolojesukibok.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/103789577360f6c6ec0685b.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/426b8679eefd30f4f9fc7c4ee14dd124/kibinosavizegirufid.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/7109504128.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/xusajamesiriwifezo.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094370d9b91a---revisagorubomaxanozu.pdfIn PDF document text
    • https://phr4u.com/files/88815353354.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/64810a8962fef5694b58e9df9817b3aa/genaxegesibapasar.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/73999614157.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/gafubuxifaboge.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_off0000d42c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42C 17436 bytes
SHA-256: 3507de16e8bbbbc6a43a61103321ea3f94e5c9d053c0877eed49b68084d6e029
font_01_sfnt_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 11240 bytes
SHA-256: ca240f2ede59975c30ff7cc3127cd125dacf499be691e52021984974f9bb0e2b
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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