Malicious PDF — malware analysis report

Static analysis result for SHA-256 400bd67d72d8638d…

MALICIOUS

PDF

89.1 KB Created: 2021-07-31 16:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: b78fdf88df6ef63598d4e4ee02cbf50b SHA-1: d299e389bc47142fc6a87fecfdc08669ea2bec33 SHA-256: 400bd67d72d8638d71e267f8c316c9a7b1631c7e5a0daf36d2e4c2e6367afc15
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits a vulnerability for client execution. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The primary purpose appears to be redirecting users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 https://pistant.ru/uplcv?utm_term=ejercicios+sobre+resolucion+de+triangulos+rectangulos PDF link annotation
    • http://ndt-tl.ru/upload/file/bedobiremojuguxasulori.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/10521459587.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bulesifezegex.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/789632332f5a792ce4fef4bcea02c52a/janiv.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/24277024478.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/dfefc364960c74c16a9f2fd2880b2c84/xuwukerif.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/jigipuwuzomefelixuf.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160807a74d0b75---xudilakimadujujovosim.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608efeb02e00b---35579536816.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/73803815865.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a944b25dee---gadabosotujasaxodijesiw.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vuboxojugugujibapokitu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/62he0i0grbj6cm9fbekh5au3b0/17423817149.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/kidirexakevikuz.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vodagofor.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/0763a572edc80b51c9442f1554be33fe/nexavababuzadujexafiw.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/19273045726.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/c940697c2bd72c211c017f440030e650/jesumavixop.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/risepawuza.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/nanepekazomawopojubegepi.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/iaevt8pi31mnei8b6mdpllf825/giwekaluxijibenumerid.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076172671cda---wotudepejuvit.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56fea51b36---65950287003.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc606eb348---lorubab.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160fa35d5babf9---niwijofegexa.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/tidorunesevusare.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_off0000f306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 10900 bytes
SHA-256: ac7f80ed0eecf747ad511757bd9ccd9a4016db4ab9906d50da580ac0ddc743d4
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 18552 bytes
SHA-256: a82b43e2ff26bc747eb4f719545fe9f56ba1f7831dc62aba4a23318935df2a15
font_02_sfnt_off00013afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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