Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1af40b988e47245…

MALICIOUS

PDF

87.3 KB Created: 2021-07-05 00:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d2d5dedf894adad73ae4dac8f0f16681 SHA-1: f9a28cc2ccb2a9d67ce35de896e310536b0e6b5b SHA-256: f1af40b988e472457aff769d5d759837ce2dba667cad0080ad00446cfbedb186
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The document body is unreadable, but the heuristics and numerous unknown URLs suggest a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160abc10dc4b80---dejamomodojofavil.pdf In PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/9jkphn50mkd6o7uhl81pcus4t5/sexolepufixaxavawilef.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/nukaxikifebenuvupakisor.pdfIn PDF document text
    • http://yongqingtech.com/d/files/kuporutiraxuk.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/wiloxulopu.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/91108007132.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/a97e7db9a240ef087ad7b28bfaf36499/dovikapekifonimabi.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/be4cb7e96a608441bf2cdb879a331cff/dejirubomulojixuzuwo.pdfIn PDF document text
    • http://pritchardreunion.com/clients/81409/File/96629807713.pdfIn PDF document text
    • https://olterus.com/contents//files/likukiri.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f03f7ba816---latukadudelekiwejekusak.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8efr6puluq3svl1edqo1hnmnf0/masewekax.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/vedikuzavafuxopovotatefe.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/hvtnos7ejlt4sueuk15g3bns9t/83165702801.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/tajilepi.pdfIn PDF document text
    • http://myredm.ru/uploads/file/91290349675.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac906dd931b---pepumatovi.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/7314462129.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e427c9779b---63650494254.pdfIn PDF document text
    • http://flomojapan.com/upload/files/noxilomodebufimu.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/84247804787.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/421a381e1189e55bbf836b68129677f2/47180624986.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916a4278def---69531019443.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dbt+core+mindfulness+worksheetsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 17948 bytes
SHA-256: d4fcd56dd1a437e4a5e024531d182b09060adcdf17477102acaf764eb620099f
font_01_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13516 11000 bytes
SHA-256: 0de449164cd9d7838f2214d10a036790c5bce12f0f81d5bfcbe252061101b33e

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