Malicious PDF — malware analysis report

Static analysis result for SHA-256 893f21d472f92aad…

MALICIOUS

PDF

83.6 KB Created: 2021-08-23 13:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 983e12a65be5d7092062755a8fd2d99e SHA-1: 9a3845063326d83385d989a812c8b50fe1263f4d SHA-256: 893f21d472f92aad8505653447a4afa864c3a9de49938021b1aed34e1cfcebaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/dovikufajetenilurimi.pdf In PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93a81d802---xigonaxitomivijaparewoxi.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/kinoluriweseg.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a001eee66---31396548604.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/bakasurezebitajerabibegi.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/jamodi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160832045de2c7---12413348139.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/96768392701.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/435773df10d14d251d8a6f71cb443dd8/43527982901.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/logepeso.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc20b6a53d---21853485575.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/732p7180ad6upsn1bfl9fvoahk/xudotubipamajajuv.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/56815347955.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9d0e9d978---molazugizigewumukuzixet.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/36089782557.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021042904295873499.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610b503694f1d---99879364033.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfe8ecc72---15347681298.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/ruzasi.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16101136e54ad6---845991638.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/roxekopuvobiwagedopigip.pdfIn PDF document text
    • http://altinay-law.com/images/file/nexazupalanubola.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9b0018cb28bd8e576751354e88c8f33f/godejonutuveviton.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/waxulo.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/55e294ffc243dca487b77c1041998117/danezalirurakuri.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/613932935a64ba21b96806315e7dcc5b/pizipavorixogirekadabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=job+prospect+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 16484 bytes
SHA-256: 1c0d5929b044ad3fab22b63f962eff3d10121d5f523c57ae83c0c2cbaba7f203
font_01_sfnt_off00010704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10704 10804 bytes
SHA-256: fdb99e96ffac1d28c78ff1b3013989bfa5654c12296046e382171dea21b9e0ad
font_02_sfnt_off00011fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB7 1860 bytes
SHA-256: 562d39cc93351683f3420870a5578826c1285db13c691c08f99be18f4980e560
font_03_sfnt_off0001286d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1286D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1